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The Sp-family genes encode important transcription factors in animal development. Here we investigate the embryonic expression… Expand BackgroundMorphogen signalling represents a key mechanism of developmental processes during animal development. Previously… Expand Delta/Notch (Dl/N) signalling is involved in the gene regulatory network underlying the segmentation process in vertebrates and… Expand A current hypothesis states that the ancestral limb of arthropods is composed of only two segments. The proximal segment… Expand The genes otd/otx, six3, pax6 and engrailed are involved in eye patterning in many animals. Here, we describe the expression… Expand The phylogenetic position of onychophorans is still being debated; however, most phylogenies suggest that onychophorans are a… Expand Our analyses of early neurogenesis in several representatives of chelicerates (e.g. spiders) and myriapods (e.g. millipedes) have… Expand