2HC8:
reference: Structure of the Actuator Domain from the Archaeoglobus fulgidus Cu(+)-ATPase(,)., Sazinsky MH, Agarwal S, Arguello JM, Rosenzweig AC, Biochemistry. 2006 Aug 22;45(33):9949-55. PMID: 16906753

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