爪(Claw),又稱爪子或鈎爪,是羊膜動物(哺乳類、鳥類及爬蟲類)於手指及腳趾末端的表皮角質層附加物。
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參考資料
- Maddin & al. (2009): The anatomy and development of the claws ofXenopus laevis (Lissamphibia: Anura) reveal alternate pathways of structural evolution in the integument of tetrapods. Journal of Anatomy, no 214 (4): pp 607-19 Abstract (頁面存檔備份,存於互聯網檔案館)
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