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  • Keratin. Occurring in all higher vertebrates, it is the principal component of their horny outer epidermal layer. Keratins are classified in alpha-keratins, which occur in mammals (around 30 variants), and beta-keratins, present in birds and reptiles.

  • Silk fibroin. Produced by insects and arachnids to fabricate structures such as cocoons, spider webs, nests, and egg stalks.

  • Collagen. Occurs in all multicellular animals and is the most abundant protein of vertebrates. Collagen is an extracellular protein that is organized into insoluble fibers of great tensile strenght. It is the major component of connective tissues such as bones, cartilagues, tendons, ligaments, and the fibrous matrices of skin and blood vessels.
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