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Kinetics of catechin (A), epicatechin (B), hesperetin (C), and eriodictyol (D) sulfation catalysed by recombinant human SULT1A3. The pNPS assay was used to assess sulfation activity. Data shown are the means ± standard deviation (SD) of three determinations. The solid line represents curve fitting to the substrate inhibition equation (2) (see the Materials and methods section).
