2WGM:
reference: Complete Ion-Coordination Structure in the Rotor Ring of Na(+)-Dependent F-ATP Synthases., Meier T, Krah A, Bond PJ, Pogoryelov D, Diederichs K, Faraldo-Gomez JD, J Mol Biol. 2009 Jun 3. PMID: 19500592

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