3E4P:
reference: C4-dicarboxylates sensing mechanism revealed by the crystal structures of DctB sensor domain., Zhou YF, Nan B, Nan J, Ma Q, Panjikar S, Liang YH, Wang Y, Su XD, J Mol Biol. 2008 Oct 31;383(1):49-61. Epub 2008 Aug 12. PMID: 18725229

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