20 citations
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December 2010 in “Journal of Morphology” Lizard claws have hair-like keratins similar to those in mammals.
115 citations
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November 2008 in “Proceedings of the National Academy of Sciences” Reptiles have genes similar to hair proteins, suggesting hair's genetic origins predate mammals.
February 2025 in “Animals” Understanding proteins in skin structures like claws and hair is crucial for future research.
36 citations
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November 2019 in “Molecular biology and evolution” Cysteine-rich keratins evolved independently in mammals, reptiles, and birds for hard skin structures like hair, claws, and feathers.
34 citations
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November 1998 in “Journal of Investigative Dermatology” A common mutation in the hHb6 gene is linked to monilethrix, but other factors may also play a role.