3FMS:
reference: Structure of Thermotoga maritima TM0439: implications for the mechanism of bacterial GntR transcription regulators with Zn2+-binding FCD domains., Zheng M, Cooper DR, Grossoehme NE, Yu M, Hung LW, Cieslik M, Derewenda U, Lesley SA, Wilson IA, Giedroc DP, Derewenda ZS, Acta Crystallogr D Biol Crystallogr. 2009 Apr;65(Pt 4):356-65. Epub 2009, Mar 19. PMID: 19307717

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