Keratin is a protein that helps form hair, nails and your skin's outer layer (epidermis). It helps support your skin, heal wounds and keep your nails and hair healthy. There are 54 kinds of keratin in your body.
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Historically, the term 'keratin' stood for all of the proteins extracted from skin modifications, such as horns, claws and hooves.
Keratin
Keratin is one of a family of structural fibrous proteins also known as scleroproteins. Alpha-keratin is a type of keratin found in vertebrates. It is the key structural material making up scales, hair, nails, feathers, horns, claws, hooves, and... Wikipedia
A type of protein found on epithelial cells, which line the inside and outside surfaces of the body. Keratins help form the tissues of the hair, nails, ...