1QBH:
reference: Solution structure of a baculoviral inhibitor of apoptosis (IAP) repeat., Hinds MG, Norton RS, Vaux DL, Day CL, Nat Struct Biol 1999 Jul;6(7):648-51. PMID: 10404221

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