Ralf Janssen

Single‐cell sequencing reveals potential novel insights into appendage‐patterning and joint‐development in a spider

Medina-Jiménez, Brenda Irene; Budd, Graham E.; Janssen, Ralf

Part of Developmental Dynamics, p. 671-697, 2026

• DOI for Single‐cell sequencing reveals potential novel insights into appendage‐patterning and joint‐development in a spider
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Conserved and diverged embryonic expression patterns of panarthropod NK-Cluster genes and new evidence for CRE-shuffling

Janssen, Ralf; Isla Cabello, Lucia; Aase-Remedios, Madeleine E.

Part of BMC Ecology and Evolution, 2026

• DOI for Conserved and diverged embryonic expression patterns of panarthropod NK-Cluster genes and new evidence for CRE-shuffling
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Pre-cheliceral region patterning in a spider provides new insights into the development and evolution of arthropod neurosecretory centres

Harper, Amber; Sumner-Rooney, Lauren; Janssen, Ralf; McGregor, Alistair P.

Part of Open Biology, 2026

• DOI for Pre-cheliceral region patterning in a spider provides new insights into the development and evolution of arthropod neurosecretory centres
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Assessing the Impact of Whole Genome Duplication on Gene Expression and Regulation During Arachnid Development

Aase-Remedios, Madeleine E.; Leite, Daniel J.; Janssen, Ralf; McGregor, Alistair P.

Part of Genome Biology and Evolution, 2025

• DOI for Assessing the Impact of Whole Genome Duplication on Gene Expression and Regulation During Arachnid Development
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Early expression of chelicerate hedgehog orthologs and its bearing on the homology of arthropod head segments

Janssen, Ralf

Part of DISCOVER DEVELOPMENTAL BIOLOGY, 2025

• DOI for Early expression of chelicerate hedgehog orthologs and its bearing on the homology of arthropod head segments
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Single‐cell sequencing reveals potential novel insights into appendage‐patterning and joint‐development in a spider

Medina-Jiménez, Brenda Irene; Budd, Graham E.; Janssen, Ralf

Part of Developmental Dynamics, p. 671-697, 2026

• DOI for Single‐cell sequencing reveals potential novel insights into appendage‐patterning and joint‐development in a spider
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Conserved and diverged embryonic expression patterns of panarthropod NK-Cluster genes and new evidence for CRE-shuffling

Janssen, Ralf; Isla Cabello, Lucia; Aase-Remedios, Madeleine E.

Part of BMC Ecology and Evolution, 2026

• DOI for Conserved and diverged embryonic expression patterns of panarthropod NK-Cluster genes and new evidence for CRE-shuffling
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Pre-cheliceral region patterning in a spider provides new insights into the development and evolution of arthropod neurosecretory centres

Harper, Amber; Sumner-Rooney, Lauren; Janssen, Ralf; McGregor, Alistair P.

Part of Open Biology, 2026

• DOI for Pre-cheliceral region patterning in a spider provides new insights into the development and evolution of arthropod neurosecretory centres
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Assessing the Impact of Whole Genome Duplication on Gene Expression and Regulation During Arachnid Development

Aase-Remedios, Madeleine E.; Leite, Daniel J.; Janssen, Ralf; McGregor, Alistair P.

Part of Genome Biology and Evolution, 2025

• DOI for Assessing the Impact of Whole Genome Duplication on Gene Expression and Regulation During Arachnid Development
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Early expression of chelicerate hedgehog orthologs and its bearing on the homology of arthropod head segments

Janssen, Ralf

Part of DISCOVER DEVELOPMENTAL BIOLOGY, 2025

• DOI for Early expression of chelicerate hedgehog orthologs and its bearing on the homology of arthropod head segments
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Single-cell RNA sequencing of mid-to-late stage spider embryos: new insights into spider development

Medina-Jiménez, Brenda Irene; Budd, Graham E.; Janssen, Ralf

Part of BMC Genomics, 2024

• DOI for Single-cell RNA sequencing of mid-to-late stage spider embryos: new insights into spider development
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Developmental and genomic insight into the origin of the tardigrade body plan

Smith, Frank W.; Game, Mandy; Mapalo, Marc A.; Chavarria, Raul A. et al.

Part of Evolution & Development, 2024

• DOI for Developmental and genomic insight into the origin of the tardigrade body plan
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Single-cell sequencing suggests a conserved function of Hedgehog-signalling in spider eye development

Medina-Jiménez, Brenda I.; Budd, Graham E.; Pechmann, Matthias; Posnien, Nico et al.

Part of EvoDevo, 2024

• DOI for Single-cell sequencing suggests a conserved function of Hedgehog-signalling in spider eye development
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New insights into mesoderm and endoderm development, and the nature of the onychophoran blastopore

Janssen, Ralf; Budd, Graham

Part of Frontiers in Zoology, 2024

• DOI for New insights into mesoderm and endoderm development, and the nature of the onychophoran blastopore
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Evolution of the Spider Homeobox Gene Repertoire by Tandem and Whole Genome Duplication

Aase-Remedios, Madeleine E.; Janssen, Ralf; Leite, Daniel J.; Sumner-Rooney, Lauren et al.

Part of Molecular biology and evolution, 2023

• DOI for Evolution of the Spider Homeobox Gene Repertoire by Tandem and Whole Genome Duplication
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Expression of posterior Hox genes and opisthosomal appendage development in a mygalomorph spider

Janssen, Ralf; Pechmann, Matthias

Part of Development, Genes and Evolution, p. 107-121, 2023

• DOI for Expression of posterior Hox genes and opisthosomal appendage development in a mygalomorph spider
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Comment on "The lower Cambrian lobopodian Cardiodictyon resolves the origin of euarthropod brains"

Budd, Graham; Mayer, Georg; Janssen, Ralf; Eriksson, B. Joakim

Part of Science, 2023

• DOI for Comment on "The lower Cambrian lobopodian Cardiodictyon resolves the origin of euarthropod brains"

Expression of netrin and its receptors uncoordinated-5 and frazzled in arthropods and onychophorans suggests conserved and diverged functions in neuronal pathfinding and synaptogenesis

Janssen, Ralf; Budd, Graham E.

Part of Developmental Dynamics, p. 172-185, 2023

• DOI for Expression of netrin and its receptors uncoordinated-5 and frazzled in arthropods and onychophorans suggests conserved and diverged functions in neuronal pathfinding and synaptogenesis

Phylogenetic analysis of forkhead transcription factors in the Panarthropoda

Schomburg, Christoph; Janssen, Ralf; Prpic, Nikola-Michael

Part of Development, Genes and Evolution, p. 39-48, 2022

• DOI for Phylogenetic analysis of forkhead transcription factors in the Panarthropoda
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Embryonic expression patterns of Wnt genes in the RTA-clade spider Cupiennius salei

Janssen, Ralf; Eriksson, Bo Joakim

Part of Gene Expression Patterns, 2022

• DOI for Embryonic expression patterns of Wnt genes in the RTA-clade spider Cupiennius salei
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Lack of evidence for conserved parasegmental grooves in arthropods

Janssen, Ralf; Turetzek, Natascha; Pechmann, Matthias

Part of Development, Genes and Evolution, p. 27-37, 2022

• DOI for Lack of evidence for conserved parasegmental grooves in arthropods
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A comprehensive study of arthropod and onychophoran Fox gene expression patterns

Janssen, Ralf; Schomburg, Christoph; Prpic, Nikola-Michael; Budd, Graham

Part of PLOS ONE, 2022

• DOI for A comprehensive study of arthropod and onychophoran Fox gene expression patterns
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Molecular evidence for a single origin of ultrafiltration-based excretory organs

Gasiorowski, Ludwik; Andrikou, Carmen; Janssen, Ralf; Bump, Paul et al.

Part of Current Biology, p. 3629-+, 2021

• DOI for Molecular evidence for a single origin of ultrafiltration-based excretory organs

Widespread retention of ohnologs in key developmental gene families following whole-genome duplication in arachnopulmonates

Harper, Amber; Gonzalez, Luis Baudouin; Schonauer, Anna; Janssen, Ralf et al.

Part of G3, 2021

• DOI for Widespread retention of ohnologs in key developmental gene families following whole-genome duplication in arachnopulmonates
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Panarthropod tiptop/teashirt and spalt orthologs and their potential role as "trunk"-selector genes

Jimenez, Brenda Irene Medina; Budd, Graham; Janssen, Ralf

Part of EvoDevo, 2021

• DOI for Panarthropod tiptop/teashirt and spalt orthologs and their potential role as "trunk"-selector genes
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A chelicerate Wnt gene expression atlas: novel insights into the complexity of arthropod Wnt-patterning

Janssen, Ralf; Pechmann, Matthias; Turetzek, Natascha

Part of EvoDevo, 2021

• DOI for A chelicerate Wnt gene expression atlas: novel insights into the complexity of arthropod Wnt-patterning
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Oscillating waves of Fox, Cyclin and CDK gene expression indicate unique spatiotemporal control of cell cycling during nervous system development in onychophorans

Janssen, Ralf; Budd, Graham E.

Part of Arthropod structure & development, 2021

• DOI for Oscillating waves of Fox, Cyclin and CDK gene expression indicate unique spatiotemporal control of cell cycling during nervous system development in onychophorans

Expression of the zinc finger transcription factor Sp6-9 in the velvet worm Euperipatoides kanangrensis suggests a conserved role in appendage development in Panarthropoda

Janssen, Ralf; Budd, Graham

Part of Development, Genes and Evolution, p. 239-245, 2020

• DOI for Expression of the zinc finger transcription factor Sp6-9 in the velvet worm Euperipatoides kanangrensis suggests a conserved role in appendage development in Panarthropoda
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The forkhead box containing transcription factor FoxB is a potential component of dorsal-ventral body axis formation in the spider Parasteatoda tepidariorum

Heingård, Miriam; Janssen, Ralf

Part of Development, Genes and Evolution, p. 65-73, 2020

• DOI for The forkhead box containing transcription factor FoxB is a potential component of dorsal-ventral body axis formation in the spider Parasteatoda tepidariorum
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The embryonic expression pattern of a second, hitherto unrecognized, paralog of the pair-rule gene sloppy-paired in the beetle Tribolium castaneum

Janssen, Ralf

Part of Development, Genes and Evolution, p. 247-256, 2020

• DOI for The embryonic expression pattern of a second, hitherto unrecognized, paralog of the pair-rule gene sloppy-paired in the beetle Tribolium castaneum
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Phylogenetic analysis and embryonic expression of panarthropod Dmrt genes

Panara, Virginia; Budd, Graham; Janssen, Ralf

Part of Frontiers in Zoology, 2019

• DOI for Phylogenetic analysis and embryonic expression of panarthropod Dmrt genes
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FoxB, a new and highly conserved key factor in arthropod dorsal-ventral (DV) limb patterning

Heingård, Miriam; Turetzek, Natascha; Prpic, Nikola-Michael; Janssen, Ralf

Part of EvoDevo, 2019

• DOI for FoxB, a new and highly conserved key factor in arthropod dorsal-ventral (DV) limb patterning
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Embryonic expression of priapulid Wnt genes

Högvall, Mattias; Vellutini, Bruno C.; Martin-Duran, Jose M.; Hejnol, Andreas et al.

Part of Development, Genes and Evolution, p. 125-135, 2019

• DOI for Embryonic expression of priapulid Wnt genes
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The last common ancestor of Ecdysozoa had an adult terminal mouth

Ortega-Hernandez, Javier; Janssen, Ralf; Budd, Graham

Part of Arthropod structure & development, p. 155-158, 2019

• DOI for The last common ancestor of Ecdysozoa had an adult terminal mouth

Gene expression analysis of potential morphogen signalling modifying factors in Panarthropoda

Hogvall, Mattias; Budd, Graham; Janssen, Ralf

Part of EvoDevo, 2018

• DOI for Gene expression analysis of potential morphogen signalling modifying factors in Panarthropoda
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Embryonic expression patterns and phylogenetic analysis of panarthropod sox genes: insight into nervous system development, segmentation and gonadogenesis

Janssen, Ralf; Andersson, Emil; Betnér, Ellinor; Bijl, Sifra et al.

Part of BMC Evolutionary Biology, 2018

• DOI for Embryonic expression patterns and phylogenetic analysis of panarthropod sox genes: insight into nervous system development, segmentation and gonadogenesis
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Embryonic expression of a Long Toll (Loto) gene in the onychophorans Euperipatoides kanangrensis and Cephalofovea clandestina

Janssen, Ralf; Lionel, Linushiya

Part of Development, Genes and Evolution, p. 171-178, 2018

• DOI for Embryonic expression of a Long Toll (Loto) gene in the onychophorans Euperipatoides kanangrensis and Cephalofovea clandestina
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The house spider genome reveals an ancient whole-genome duplication during arachnid evolution

Schwager, Evelyn E.; Sharma, Prashant P.; Clarke, Thomas; Leite, Daniel J. et al.

Part of BMC Biology, 2017

• DOI for The house spider genome reveals an ancient whole-genome duplication during arachnid evolution
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Comparative analysis of gene expression patterns in the arthropod labrum and the onychophoran frontal appendages, and its implications for the arthropod head problem

Janssen, Ralf

Part of EvoDevo, 2017

• DOI for Comparative analysis of gene expression patterns in the arthropod labrum and the onychophoran frontal appendages, and its implications for the arthropod head problem
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Investigation of endoderm marker-genes during gastrulation and gut-development in the velvet worm Euperipatoides kanangrensis

Janssen, Ralf; Budd, Graham

Part of Developmental Biology, p. 155-164, 2017

• DOI for Investigation of endoderm marker-genes during gastrulation and gut-development in the velvet worm Euperipatoides kanangrensis

Origin and Evolution of the Panarthropod Head - a Deep Time Perspective

Ortega-Hernandez, J.; Janssen, Ralf; Budd, Graham

Part of Integrative and Comparative Biology, 2017

A molecular view of onychophoran segmentation

Janssen, Ralf

Part of Arthropod structure & development, p. 341-353, 2017

• DOI for A molecular view of onychophoran segmentation

Gene expression reveals evidence for EGFR-dependent proximal-distal limb patterning in a myriapod

Janssen, Ralf

Part of Evolution & Development, p. 124-135, 2017

• DOI for Gene expression reveals evidence for EGFR-dependent proximal-distal limb patterning in a myriapod
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Gene expression analysis reveals that Delta/Notch signalling is not involved in onychophoran segmentation

Janssen, Ralf; Budd, Graham E.

Part of Development, Genes and Evolution, p. 69-77, 2016

• DOI for Gene expression analysis reveals that Delta/Notch signalling is not involved in onychophoran segmentation
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The evolution and expression of panarthropod frizzled genes

Janssen, Ralf; Schönauer, Anna; Weber, Melanie; Turetzek, Natascha et al.

Part of Frontiers in Ecology and Evolution, 2015

• DOI for The evolution and expression of panarthropod frizzled genes
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Fate and nature of the onychophoran mouth-anus furrow and its contribution to the blastopore

Janssen, Ralf; Jorgensen, Mette; Lagebro, Linda; Budd, Graham E.

Part of Proceedings of the Royal Society of London. Biological Sciences, 2015

• DOI for Fate and nature of the onychophoran mouth-anus furrow and its contribution to the blastopore

Aspects of dorso-ventral and proximo-distal limb patterning in onychophorans

Janssen, Ralf; Jörgensen, Mette; Prpic, Nikola-Michael; Budd, Graham

Part of Evolution & Development, p. 21-33, 2015

• DOI for Aspects of dorso-ventral and proximo-distal limb patterning in onychophorans
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Gene expression suggests double-segmental and single-segmental patterning mechanisms during posterior segment addition in the beetle Tribolium castaneum

Janssen, Ralf

Part of International Journal of Developmental Biology, p. 343-347, 2014

• DOI for Gene expression suggests double-segmental and single-segmental patterning mechanisms during posterior segment addition in the beetle Tribolium castaneum

Onychophoran Hox genes and the evolution of arthropod Hox gene expression

Janssen, Ralf; Eriksson, Bo Joakim; Tait, Noel N.; Budd, Graham E.

Part of Frontiers in Zoology, p. 22, 2014

• DOI for Onychophoran Hox genes and the evolution of arthropod Hox gene expression
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Analysis of the Wnt gene repertoire in an onychophoran provides new insights into the evolution of segmentation

Hogvall, Mattias; Schoenauer, Anna; Budd, Graham E.; McGregor, Alistair P. et al.

Part of EvoDevo, p. 14, 2014

• DOI for Analysis of the Wnt gene repertoire in an onychophoran provides new insights into the evolution of segmentation
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Expression of arthropod distal limb-patterning genes in the onychophoran Euperipatoides kanangrensis

Oliveira, Marta Bastos; Liedholm, Simon Eckerström; Lopez, Jordi Estefa; Lochte, Annalena A. et al.

Part of Development, Genes and Evolution, p. 87-96, 2014

• DOI for Expression of arthropod distal limb-patterning genes in the onychophoran Euperipatoides kanangrensis
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Identification and embryonic expression of Wnt2, Wnt4, Wnt5 and Wnt9 in the millipede Glomeris marginata (Myriapoda: Diplopoda)

Janssen, Ralf; Posnien, Nico

Part of Gene Expression Patterns, p. 55-61, 2014

• DOI for Identification and embryonic expression of Wnt2, Wnt4, Wnt5 and Wnt9 in the millipede Glomeris marginata (Myriapoda: Diplopoda)
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Developmental abnormalities in Glomeris marginata (Villers 1789) (Myriapoda: Diplopoda): implications for body axis determination in a myriapod

Janssen, Ralf

Part of Die Naturwissenschaften, p. 33-43, 2013

• DOI for Developmental abnormalities in Glomeris marginata (Villers 1789) (Myriapoda: Diplopoda): implications for body axis determination in a myriapod
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Deciphering the onychophoran 'segmentation gene cascade': Gene expression reveals limited involvement of pair rule gene orthologs in segmentation, but a highly conserved segment polarity gene network

Janssen, Ralf; Budd, Graham E.

Part of Developmental Biology, p. 224-234, 2013

• DOI for Deciphering the onychophoran 'segmentation gene cascade': Gene expression reveals limited involvement of pair rule gene orthologs in segmentation, but a highly conserved segment polarity gene network

A curious abnormally developed embryo of the pill millipede Glomeris marginata (Villers, 1789)

Janssen, Ralf

Part of ZooKeys, p. 67-75, 2013

• DOI for A curious abnormally developed embryo of the pill millipede Glomeris marginata (Villers, 1789)
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Segment polarity gene expression in a myriapod reveals conserved and diverged aspects of early head patterning in arthropods

Janssen, Ralf

Part of Development, Genes and Evolution, p. 299-309, 2012

• DOI for Segment polarity gene expression in a myriapod reveals conserved and diverged aspects of early head patterning in arthropods

Expression of pair rule gene orthologs in the blastoderm of a myriapod: evidence for pair rule-like mechanisms?

Janssen, Ralf; Damen, Wim G. M.; Budd, Graham E.

Part of BMC Developmental Biology, p. 15, 2012

• DOI for Expression of pair rule gene orthologs in the blastoderm of a myriapod: evidence for pair rule-like mechanisms?
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Deuterostomic Development in the Protostome Priapulus caudatus

Martin-Duran, Jose M.; Janssen, Ralf; Wennberg, Sofia; Budd, Graham E. et al.

Part of Current Biology, p. 2161-2166, 2012

• DOI for Deuterostomic Development in the Protostome Priapulus caudatus

Expression of collier in the premandibular segment of myriapods: support for the traditional Atelocerata concept or a case of convergence?

Janssen, Ralf; Damen, Wim G. M.; Budd, Graham E.

Part of BMC Evolutionary Biology, p. 50, 2011

• DOI for Expression of collier in the premandibular segment of myriapods: support for the traditional Atelocerata concept or a case of convergence?
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Expression of myriapod pair rule gene orthologs

Janssen, Ralf; Budd, Graham E; Prpic, Nikola-Michael; Damen, Wim

Part of EvoDevo, 2011

• DOI for Expression of myriapod pair rule gene orthologs
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An abnormally developed embryo of the pill millipede Glomeris marginata that lacks dorsal segmental derivatives

Janssen, Ralf

Part of Development, Genes and Evolution, p. 351-355, 2011

• DOI for An abnormally developed embryo of the pill millipede Glomeris marginata that lacks dorsal segmental derivatives

Diplosegmentation in the pill millipede Glomeris marginata is the result of dorsal fusion

Janssen, Ralf

Part of Evolution & Development, p. 477-487, 2011

• DOI for Diplosegmentation in the pill millipede Glomeris marginata is the result of dorsal fusion

Gene expression suggests conserved mechanisms patterning the heads of insects and myriapods

Janssen, Ralf; Budd, Graham E.; Damen, Wim G. M.

Part of Developmental Biology, p. 64-72, 2011

• DOI for Gene expression suggests conserved mechanisms patterning the heads of insects and myriapods

Conservation, loss, and redeployment of Wnt ligands in protostomes: implications for understanding the evolution of segment formation

Janssen, Ralf; Le Gouar, Martine; Pechmann, Matthias; Poulin, Francis et al.

Part of BMC Evolutionary Biology, p. 374, 2010

• DOI for Conservation, loss, and redeployment of Wnt ligands in protostomes: implications for understanding the evolution of segment formation
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Gene expression suggests conserved aspects of Hox gene regulation in arthropods and provides additional support for monophyletic Myriapoda

Janssen, Ralf; Budd, Graham E.

Part of EvoDevo, 2010

• DOI for Gene expression suggests conserved aspects of Hox gene regulation in arthropods and provides additional support for monophyletic Myriapoda
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Head patterning and Hox gene expression in an onychophoran and its implications for the arthropod head problem

Eriksson, Bo Joakim; Tait, Noel N.; Budd, Graham E.; Janssen, Ralf et al.

Part of Development, Genes and Evolution, p. 117-122, 2010

• DOI for Head patterning and Hox gene expression in an onychophoran and its implications for the arthropod head problem
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Gene expression patterns in an onychophoran reveal that regionalization predates limb segmentation in pan-arthropods

Janssen, Ralf; Eriksson, Bo Joakim; Budd, Graham E.; Akam, Michael et al.

Part of Evolution & Development, p. 363-372, 2010

• DOI for Gene expression patterns in an onychophoran reveal that regionalization predates limb segmentation in pan-arthropods
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Comprehensive survey of developmental genes in the pea aphid, Acyrthosiphon pisum: frequent lineage-specific duplications and losses of developmental genes

Shigenobu, S.; Bickel, R. D.; Brisson, J. A.; Butts, T. et al.

Part of Insect molecular biology (Print), p. 47-62, 2010

• DOI for Comprehensive survey of developmental genes in the pea aphid, Acyrthosiphon pisum: frequent lineage-specific duplications and losses of developmental genes

Genome Sequence of the Pea Aphid Acyrthosiphon pisum

Richards, Stephen; Gibbs, Richard A.; Gerardo, Nicole M.; Moran, Nancy et al.

Part of PLoS biology, 2010

• DOI for Genome Sequence of the Pea Aphid Acyrthosiphon pisum
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Embryonic development and the understanding of the adult body plan in myriapods

Damen, Wim; Prpic, Nikola-Michael; Janssen, Ralf

Part of Soil Organisms, p. 337-346, 2009

The hatching larva of the priapulid worm Halicryptus spinulosus

Janssen, Ralf; Wennberg, Sofia A.; Budd, Graham E.

Part of Frontiers in Zoology, 2009

• DOI for The hatching larva of the priapulid worm Halicryptus spinulosus
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Hatching and earliest larval stages of the priapulid worm Priapulus caudatus

Wennberg, Sofia A.; Janssen, Ralf; Budd, Graham E.

Part of Invertebrate biology., p. 157-171, 2009

• DOI for Hatching and earliest larval stages of the priapulid worm Priapulus caudatus

Early embryonic development of the priapulid worm Priapulus caudatus

Wennberg, Sofia; Janssen, Ralf; Budd, Graham E.

Part of Evolution & Development, p. 326-338, 2008

• DOI for Early embryonic development of the priapulid worm Priapulus caudatus
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Evidence for Wg-independent tergite boundary formation in the millipede Glomeris marginata

Janssen, Ralf; Budd, Graham E.; Damen, Wim G. M.; Prpic, Nikola-Michael

Part of Development, Genes and Evolution, p. 361-370, 2008

• DOI for Evidence for Wg-independent tergite boundary formation in the millipede Glomeris marginata

Diverged and conserved aspects of heart formation in a spider

Janssen, Ralf; Damen, Wim G. M.

Part of Evolution & Development, p. 155-165, 2008

• DOI for Diverged and conserved aspects of heart formation in a spider

The T-box genes H15 and optomotor-blind in the spiders Cupiennius salei, Tegenaria atrica and Achaearanea tepidariorum and the dorsoventral axis of arthropod appendages

Janssen, Ralf; Feitosa, Natalia M.; Damen, Wim G. M.; Prpic, Nikola-Michael

Part of Evolution & Development, p. 143-154, 2008

• DOI for The T-box genes H15 and optomotor-blind in the spiders Cupiennius salei, Tegenaria atrica and Achaearanea tepidariorum and the dorsoventral axis of arthropod appendages
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A review of the correlation of tergites, sternites, and leg pairs in diplopods

Janssen, Ralf; Prpic, Nicola-Michael; Damen, Wim G.M.

Part of Frontiers in Zoology, 2006

• DOI for A review of the correlation of tergites, sternites, and leg pairs in diplopods
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The ten Hox genes of the millipede Glomeris marginata

Janssen, Ralf; Damen, Wim G.M.

Part of Development, Genes and Evolution, p. 451-465, 2006

• DOI for The ten Hox genes of the millipede Glomeris marginata

Dorso-ventral differences in gene expression in Glomeris marginata Villers, 1789 (Myriapoda: Diplopoda)

Janssen, Ralf; Prpic, Nicola-Michael; Damen, Wim. G.M.

Part of Norwegian Journal of Entomology, p. 129-137, 2006

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Evolution of dorsal–ventral axis formation in arthropod appendages: H15 and optomotor-blind/bifid-type T-box genes in the millipede Glomeris marginata (Myriapoda: Diplopoda)

Prpic, Nikola-Michael; Janssen, Ralf; Damen, Wim; Tautz, Diethard

Part of Evolution & Development, p. 51-57, 2005

• DOI for Evolution of dorsal–ventral axis formation in arthropod appendages: H15 and optomotor-blind/bifid-type T-box genes in the millipede Glomeris marginata (Myriapoda: Diplopoda)

Pair rule gene orthologs in spider segmentation

Damen, Wim; Janssen, Ralf; Prpic, Nikola-Michael

Part of Evolution & Development, p. 618-628, 2005

• DOI for Pair rule gene orthologs in spider segmentation

Gene expression suggests decoupled dorsal and ventral segmentation in the millipede Glomeris marginata (Myriapoda: Diplopoda)

Janssen, Ralf; Prpic, Nikola-Michael; Damen, Wim

Part of Developmental Biology, p. 89-104, 2004

• DOI for Gene expression suggests decoupled dorsal and ventral segmentation in the millipede Glomeris marginata (Myriapoda: Diplopoda)
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Gene expression in spider appendages reveals reversal of exd/hth spatial specificity, altered leg gap gene dynamics, and suggests divergent distal morphogen signaling

Prpic, Nikola-Michael; Janssen, Ralf; Wigand, Barbara; Klingler, Martin et al.

Part of Developmental Biology, p. 119-140, 2003

Hox genes in spiders: Their significance for development and evolution

Turetzek, Natascha; Pechmann, Matthias; Janssen, Ralf; Prpic, Nikola-Michael

Part of Seminars in Cell and Developmental Biology, p. 24-34, 2024

• DOI for Hox genes in spiders: Their significance for development and evolution

Review of extra-embryonic tissues in the closest arthropod relatives, onychophorans and tardigrades

Treffkorn, Sandra; Mayer, Georg; Janssen, Ralf

Part of Philosophical Transactions of the Royal Society of London. Biological Sciences, 2022

• DOI for Review of extra-embryonic tissues in the closest arthropod relatives, onychophorans and tardigrades

Origin and evolution of the panarthropod head: A palaeobiological and developmental perspective

Ortega-Hernandez, Javier; Janssen, Ralf; Budd, Graham E.

Part of Arthropod structure & development, p. 354-379, 2017

• DOI for Origin and evolution of the panarthropod head: A palaeobiological and developmental perspective

A simple dissociation protocol for single-cell RNA sequencing of spider embryos

Jimenez, Brenda Irene Medina; Janssen, Ralf

Single-cell sequencing reveals novel insights into spider eye development

Medina-Jiménez, Brenda I.; Budd, Graham E.; Pechmann, Matthias; Posnien, Nico et al.