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Types of enzymatic collagen cross-links. Divalent cross-links are formed between two side chains, one of the telopeptide region and the other one of the triple helical regions of the neighboring collagen molecule. Trivalent cross-links are formed between two residues of the telopeptide region of one collagen molecule and one of the triple helical regions of the neighboring collagen molecule. To see this figure in color, go online.
