1OCA:
reference: The NMR solution conformation of unligated human cyclophilin A., Ottiger M, Zerbe O, Guntert P, Wuthrich K, J Mol Biol 1997 Sep 12;272(1):64-81. PMID: 9299338

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