6MP5:
reference: X-Ray Structure of Human Sulfide:Quinone Oxidoreductase: Insights into the Mechanism of Mitochondrial Hydrogen Sulfide Oxidation., Jackson MR, Loll PJ, Jorns MS, Structure. 2019 Mar 15. pii: S0969-2126(19)30080-2. doi:, 10.1016/j.str.2019.03.002. PMID: 30905673

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