| 3TVZ: reference: Bacillus subtilis HmoB is a heme oxygenase with a novel structure., Park S, Choi S, Choe J, BMB Rep. 2012 Apr;45(4):239-41. PMID: 22531134 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).