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Development of epithelial appendages.
Evolutionary tree for the primates. Previous Image | Download Original | Next Image Relatively simple changes in Hox genes control limb formation in tetrapods.
DESCRIPTION(a) Epithelial appendages begin as an outgrowth of the epidermis and dermis. In the development of feathers and hair, this outgrowth gives way to the formation of a follicle. (b) The difference between the identities of different epithelial appendages, such as scales and feathers, are caused, in part, by the timing and level of early signalling events.
Posted by: ppk
Date posted: Jul 24, 2011
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