6EYU:
reference: Inward H(+) pump xenorhodopsin: Mechanism and alternative optogenetic approach., Shevchenko V, Mager T, Kovalev K, Polovinkin V, Alekseev A, Juettner J, Chizhov I, Bamann C, Vavourakis C, Ghai R, Gushchin I, Borshchevskiy V, Rogachev A, Melnikov I, Popov A, Balandin T, Rodriguez-Valera F, Manstein DJ, Bueldt G, Bamberg E, Gordeliy V, Sci Adv. 2017 Sep 22;3(9):e1603187. doi: 10.1126/sciadv.1603187. eCollection 2017, Sep. PMID: 28948217

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