2AGV:
reference: Inaugural Article: Structural role of countertransport revealed in Ca2+ pump crystal structure in the absence of Ca2+., Obara K, Miyashita N, Xu C, Toyoshima I, Sugita Y, Inesi G, Toyoshima C, Proc Natl Acad Sci U S A 2005 Oct 11;102(41):14489-96. Epub 2005 Sep 6. PMID: 16150713

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