4YS0:
reference: Conformational changes of the clamp of the protein translocation ATPase SecA., Chen Y, Bauer BW, Rapoport TA, Gumbart JC, J Mol Biol. 2015 May 14. pii: S0022-2836(15)00287-9. doi:, 10.1016/j.jmb.2015.05.003. PMID: 25982945

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