4IX9:
reference: Crystal and NMR structures give insights into the role and dynamics of subunit F of the eukaryotic V-ATPase from Saccharomyces cerevisiae., Basak S, Lim J, Manimekalai MS, Balakrishna AM, Gruber G, J Biol Chem. 2013 Apr 26;288(17):11930-9. doi: 10.1074/jbc.M113.461533. Epub 2013, Mar 8. PMID: 23476018

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