| 4JQ6: reference: Cross-protomer interaction with the photoactive site in oligomeric proteorhodopsin complexes., Ran T, Ozorowski G, Gao Y, Sineshchekov OA, Wang W, Spudich JL, Luecke H, Acta Crystallogr D Biol Crystallogr. 2013 Oct;69(Pt 10):1965-80. doi:, 10.1107/S0907444913017575. Epub 2013 Sep 20. PMID: 24100316 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).