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Analysis of EphA4 in the lesser spotted catshark identifies a primitive gnathostome expression pattern and reveals co-option during evolution of shark-specific morphology

BiologyMorphological EvidenceReveals Co-optionAxial SkeletonVertebrate DevelopmentDevelopmental BiologyPhylogeneticsMedicineMammalogyEvolutionary BiologyShark-specific MorphologyNatural SciencesMorphogenesisAnatomyMarine BiologyCatshark IdentifiesEvolutionary Developmental Biology