Collagen is the most abundant protein in the body, accounting for as much as 30% of the total body mass. Collagen is diverse: in the skin, there is not 1 but 16 collagens, all bonded together to create a matrix. They can be classified into 4 families, according to their location in the skin and their role: junctional collagens, bonding collagens, initiator collagens and pillar collagens.
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