1P8H:
reference: Crystallographic structures of the M and N intermediates of bacteriorhodopsin: assembly of a hydrogen-bonded chain of water molecules between Asp-96 and the retinal Schiff base., Schobert B, Brown LS, Lanyi JK, J Mol Biol 2003 Jul 11;330(3):553-70. PMID: 12842471

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