3WKY:
reference: Crystal structure of a crustacean prophenoloxidase provides a clue to understanding the functionality of the type 3 copper proteins., Masuda T, Momoji K, Hirata T, Mikami B, FEBS J. 2014 Apr 10. doi: 10.1111/febs.12812. PMID: 24720693

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