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Keyword - Keratin (KW-0416)


Fibrous proteins rich in cysteine and the chief constituent of horn, nails, hair, epidermis and feathers. Two major conformational groups have been characterized, alpha-keratin, whose peptide backbone forms an alpha-helix, and beta-keratin, whose backbone forms a zigzag or pleated sheet structure.


Cellular component


intermediate filament [ GO:0005882 ]


KeratinCellular component
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