1AFJ:
reference: Structures of the reduced and mercury-bound forms of MerP, the periplasmic protein from the bacterial mercury detoxification system., Steele RA, Opella SJ, Biochemistry 1997 Jun 10;36(23):6885-95. PMID: 9188683

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