4U87:
reference: Conformational plasticity of RepB, the replication initiator protein of promiscuous streptococcal plasmid pMV158., Boer DR, Ruiz-Maso JA, Rueda M, Petoukhov MV, Machon C, Svergun DI, Orozco M, Del Solar G, Coll M, Sci Rep. 2016 Feb 15;6:20915. doi: 10.1038/srep20915. PMID: 26875695

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