3H4H:
reference: Directed evolution of copper nitrite reductase to a chromogenic reductant., Macpherson IS, Rosell FI, Scofield M, Mauk AG, Murphy ME, Protein Eng Des Sel. 2010 Jan 18. PMID: 20083495

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