1HC1:
reference: Crystal structure of hexameric haemocyanin from Panulirus interruptus refined at 3.2 A resolution., Volbeda A, Hol WG, J Mol Biol 1989 Sep 20;209(2):249-79. PMID: 2585484

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