5IAX:
reference: Bacillus anthracis Prolyl 4-Hydroxylase Modifies Collagen-like Substrates in Asymmetric Patterns., Schnicker NJ, Dey M, J Biol Chem. 2016 Apr 21. pii: jbc.M116.725432. PMID: 27129244

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