1L9H:
reference: Functional role of internal water molecules in rhodopsin revealed by X-ray crystallography., Okada T, Fujiyoshi Y, Silow M, Navarro J, Landau EM, Shichida Y, Proc Natl Acad Sci U S A 2002 Apr 30;99(9):5982-7. PMID: 11972040

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