3ABN:
reference: Crystal structure of the collagen model peptide (Pro-Pro-Gly)4 -Hyp-Asp-Gly-(Pro-Pro-Gly)4 at 1.0 A resolution., Okuyama K, Kawaguchi T, Shimura M, Noguchi K, Mizuno K, Bachinger HP, Biopolymers. 2013 Jul;99(7):436-47. doi: 10.1002/bip.22198. PMID: 23616212

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).