5D8C:
reference: Structural basis of thiol-based regulation of formaldehyde detoxification in H. influenzae by a MerR regulator with no sensor region., Counago RM, Chen NH, Chang CW, Djoko KY, McEwan AG, Kobe B, Nucleic Acids Res. 2016 Jun 15. pii: gkw543. PMID: 27307602

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