4OF9:
reference: Structures of K42N and K42Y sperm whale myoglobins point to an inhibitory role of distal water in peroxidase activity., Wang C, Lovelace LL, Sun S, Dawson JH, Lebioda L, Acta Crystallogr D Biol Crystallogr. 2014 Nov;70(Pt 11):2833-9. doi:, 10.1107/S1399004714017787. Epub 2014 Oct 16. PMID: 25372675

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