3A3Y:
reference: Crystal structure of the sodium-potassium pump (Na+,K+-ATPase) with bound potassium and ouabain., Ogawa H, Shinoda T, Cornelius F, Toyoshima C, Proc Natl Acad Sci U S A. 2009 Aug 18;106(33):13742-7. Epub 2009 Aug 3. PMID: 19666591

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