3K6V:
reference: Apo and ligand-bound structures of ModA from the archaeon Methanosarcina acetivorans., Chan S, Giuroiu I, Chernishof I, Sawaya MR, Chiang J, Gunsalus RP, Arbing MA, Perry LJ, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2010 Mar 1;66(Pt, 3):242-50. Epub 2010 Feb 23. PMID: 20208152

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