1E39:
reference: Identification of the active site acid/base catalyst in a bacterial fumarate reductase: a kinetic and crystallographic study., Doherty MK, Pealing SL, Miles CS, Moysey R, Taylor P, Walkinshaw MD, Reid GA, Chapman SK, Biochemistry 2000 Sep 5;39(35):10695-701. PMID: 10978153

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