Keratin is the
cornified part of the epidermis of vertebrates and is characterized by having higher
resistance to attack by proteolytic enzymes.
Keratin is a
major component of feathers It is an insoluble structural protein in epithelial
cells of vertebrates. Keratin is also very rich in amino acids like Leucine and
Serine.
These cornified
appendages include feathers, hairs, horns, hooves nails, claws and scales.
Keratin is divided into two types. α- Keratin (It is present in wool, hair, and
horn. It is in the form of folder chain).
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