2GIM:
reference: Structure of plastocyanin from the cyanobacterium Anabaena variabilis., Schmidt L, Christensen HE, Harris P, Acta Crystallogr D Biol Crystallogr. 2006 Sep;62(Pt 9):1022-9. Epub 2006, Aug 19. PMID: 16929103

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