1F6B:
reference: Crystal structure of Sar1-GDP at 1.7 A resolution and the role of the NH2 terminus in ER export., Huang M, Weissman JT, Beraud-Dufour S, Luan P, Wang C, Chen W, Aridor M, Wilson IA, Balch WE, J Cell Biol 2001 Dec 10;155(6):937-48. PMID: 11739406

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