4I34:
reference: Nucleotide Binding and Conformational Switching in the Hexameric Ring of a AAA+ Machine., Stinson BM, Nager AR, Glynn SE, Schmitz KR, Baker TA, Sauer RT, Cell. 2013 Apr 25;153(3):628-39. doi: 10.1016/j.cell.2013.03.029. PMID: 23622246

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