1AZC:
reference: Structure of apo-azurin from Alcaligenes denitrificans at 1.8 A resolution., Shepard WE, Kingston RL, Anderson BF, Baker EN, Acta Crystallogr D Biol Crystallogr. 1993 May 1;49(Pt 3):331-43. PMID: 15299522

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