Alpha-keratin {keratin}| is in skin, hair, wool, horn, and nails. Alpha-keratin has three to seven amino acid chains in bundle, cross-linked by disulfide bonds, which then bundle again. Scales, claws, beaks, silk, and feathers have beta-keratin. Beta-keratin is mostly glycine, alanine, and serine.
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Date Modified: 2022.0224