1M9X:
reference: Structural insights into the catalytic mechanism of cyclophilin A., Howard BR, Vajdos FF, Li S, Sundquist WI, Hill CP, Nat Struct Biol 2003 Jun;10(6):475-81. PMID: 12730686

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