3I72:
reference: Nucleotide binding states of subunit A of the A-ATP synthase and the implication of P-loop switch in evolution., Kumar A, Manimekalai MS, Balakrishna AM, Jeyakanthan J, Gruber G, J Mol Biol. 2010 Feb 19;396(2):301-20. Epub 2009 Nov 26. PMID: 19944110

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