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Illustration of collagens molecular structures. (a) Schematic representation of the most abundant collagen Pro-Hyp-Gly and Pro-Lys-Gly triplets. (b) Crystal structure of a collagen model (Gly-Pro-Hyp)10 single chain helix (PDB entry 4OY5, ref. [45]). (c) The collagen triple helix of the (Pro-Pro-Gly)10 model (PDB entry 1K6F, ref. [46]). Crystal structures are depicted in colored ball-and-stick representations.
