1QYB:
reference: X-ray crystal structure of Desulfovibrio vulgaris rubrerythrin with zinc substituted into the [Fe(SCys)4] site and alternative diiron site structures., Jin S, Kurtz DM Jr, Liu ZJ, Rose J, Wang BC, Biochemistry 2004 Mar 23;43(11):3204-13. PMID: 15023070

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