3L68:
reference: Cysteine as a Modulator Residue in the Active Site of Xenobiotic Reductase A: A Structural, Thermodynamical and Kinetic Study., Spiegelhauer O, Mende S, Dickert F, Knauer SH, Ullmann GM, Dobbek H, J Mol Biol. 2010 Mar 3. PMID: 20206186

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