5G36:
reference: Crystal structure of Halobacterium salinarum halorhodopsin with a partially depopulated primary chloride-binding site., Schreiner M, Schlesinger R, Heberle J, Niemann HH, Acta Crystallogr F Struct Biol Commun. 2016 Sep;72(Pt 9):692-9. doi:, 10.1107/S2053230X16012796. Epub 2016 Aug 26. PMID: 27599860

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