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- W2142709013 abstract "Alibardi, L. 2010. Autoradiographic observations on developing and growing claws of reptiles. —Acta Zoologica (Stockholm) 91: 233–241 The present qualitative autoradiographic analysis aims to present the main features of morphogenesis and growth of claws in reptiles. Lizard embryos treated with tritiated thymidine reveal that epidermal cell proliferation in terminal digits is prevalent in the dorsal side and gives origin to the curved unguis of the claw. Less proliferation occurs in the ventral side of the digit tip where the concave sub-unguis is derived. Adult claws of a turtle show that thymidine-labelled cells are present along most of the epidermis of the claw, especially at the claw tip. Also, injection of tritiated histidine and proline, indicating active protein synthesis, confirm autoradiographic labelling along most of the epidermis of claws, in particular at the apical tip. The present study indicates that proximal matrix regions, as have been described in mammalian nails, are absent in reptiles. This pattern of claw growth probably derives from that of terminal digital scales. In fact reptilian (and avian) claws are formed from a modification of scales, a different condition from that present in mammals." @default.
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- W2142709013 date "2010-04-01" @default.
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- W2142709013 title "Autoradiographic observations on developing and growing claws of reptiles" @default.
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- W2142709013 doi "https://doi.org/10.1111/j.1463-6395.2009.00403.x" @default.
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