2GI0:
reference: The role of hydrogen bonding at the active site of a cupredoxin: the Phe114Pro azurin variant., Yanagisawa S, Banfield MJ, Dennison C, Biochemistry. 2006 Jul 25;45(29):8812-22. PMID: 16846224

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