keratin
Fibrous protein found in the skin of vertebrates and also in hair, nails, claws, hooves, feathers, and the outer coating of horns.
If pressure is put on some parts of the skin, more keratin is produced, forming thick calluses that protect the layers of skin beneath.
If pressure is put on some parts of the skin, more keratin is produced, forming thick calluses that protect the layers of skin beneath.
© RM 2012. Helicon Publishing is division of RM.
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