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The research identified two types of keratinocytes in chicken scales: one for hard scales and another for soft skin, with similarities to human skin differentiation.

Bird foot scales develop differently and can repair but not fully regenerate due to the lack of specialized stem cell areas.

Hard skin features like scales, feathers, and hair evolved through specific protein changes in different animal groups.

The skin systems of jawed vertebrates evolved diverse appendages like hair and scales from a common structure over 420 million years ago.

Key genes can rewire networks, changing skin appendage types.