glütsiini- ja proliinirikas kolmikhelikaalne kiudjas valk, mis on loomadel rakuvälise maatriksi ja sidekoe üheks põhikomponendiks ning annab sellele võimaluse venida
Collagen is the main structural protein in the extracellular space in the various connective tissues in animal bodies. As the main component of connective tissue, it is the most abundant protein in mammals, making up from 25% to 35% of the whole-body protein content. The five most common types are: Type I: skin, tendon, vascular ligature, organs, bone (main component of the organic part of bone) Type II: cartilage (main collagenous component of cartilage) Type III: reticulate (main component of reticular fibers), commonly found alongside type I. Type IV: forms basal lamina, the epithelium-secreted layer of the basement membrane. Type V: cell surfaces, hair and placenta
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Nad esinevad paljude erinevate vormidena: kollageen tüüp I, mis on kõige levinum, esineb nahas, kõõlustes ja luudes; kollageen tüüp II esineb kõhredes; kollageen tüüp IV esineb basaalses laaminas.
