2JL9:
reference: Structural explanation for the role of Mn2+ in the activity of {phi}6 RNA-dependent RNA polymerase., Poranen MM, Salgado PS, Koivunen MR, Wright S, Bamford DH, Stuart DI, Grimes JM, Nucleic Acids Res. 2008 Oct 21. PMID: 18940872

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