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Little effort has been made to apply the insights gained from studies of amphibian limb regeneration to higher vertebrates. During amphibian limb regeneration, a functional epithelium called the apical ectodermal cap (AEC) triggers a regenerative response. As long as the AEC is induced, limb regeneration will take place. Interestingly, similar responses have been observed in chicken embryos. The AEC...
Retinoic acid (RA) plays a necessary role in limb development and regeneration, but the precise mechanism by which it acts during these processes is unclear. The role of RA in limb regeneration was first highlighted by the remarkable effect that it has on respecifying the proximodistal axis of the regenerating limb so that serially repeated limbs are produced. To facilitate the study of RA signaling...
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