Fig. 7From: Developing an ancient epithelial appendage: FGF signalling regulates early tail denticle formation in sharksSchematic diagram representing gene expression during early morphogenesis of caudal denticles. This diagram summarises the results from Figs. 4 and 5, representing expression of fgf3, fgf8, shh, bmp4 and dlx2 throughout progressive stages of early morphogenesis. SE is the squamous epithelium, BE is the basal epithelium and Me is the mesenchymeBack to article page