2FMX:
reference: An open conformation of switch I revealed by Sar1-GDP crystal structure at low Mg(2+)., Rao Y, Bian C, Yuan C, Li Y, Chen L, Ye X, Huang Z, Huang M, Biochem Biophys Res Commun. 2006 Sep 29;348(3):908-915. Epub 2006 Aug 1. PMID: 16899220

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