4AX3:
reference: Structures of protein-protein complexes involved in electron transfer., Antonyuk SV, Han C, Eady RR, Hasnain SS, Nature. 2013 Apr 4;496(7443):123-6. doi: 10.1038/nature11996. Epub 2013 Mar 27. PMID: 23535590

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