3B0S:
reference: Crystal structure of (Gly-Pro-Hyp)(9) : Implications for the collagen molecular model., Okuyama K, Miyama K, Mizuno K, Bachinger HP, Biopolymers. 2012 Aug;97(8):607-16. doi: 10.1002/bip.22048. PMID: 22605552

This OCA Structure page
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