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Collagen (CAS NO.9007-34-5), its Synonyms are Atelocollagen ; Collagen fiber ; Glyceryl collagenate ; Ossein ; Osseine ; Collagens . Collagen is a group of naturally occurring proteins. In nature, it is found exclusively in animals, especially in the flesh, connective tissues, and keratin of mammals. It is the main component of connective tissue, and is the most abundant protein in mammals,making up about 25% to 35% of the whole-body protein content.
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