6A2J:
reference: Crystal structure of heme A synthase from Bacillus subtilis., Niwa S, Takeda K, Kosugi M, Tsutsumi E, Mogi T, Miki K, Proc Natl Acad Sci U S A. 2018 Nov 20;115(47):11953-11957. doi:, 10.1073/pnas.1813346115. Epub 2018 Nov 5. PMID: 30397130

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