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Modulation of P-glycoprotein (P-gp) ATPase activity by silybin diastereomers (a) and dehydrosilybin enantiomers (b). The assay was realized using the commercial P-gp-Glo assay system (Promega, Madison, WI, USA) including a membrane fraction with recombinant human P-gp. Data represent the average of three repetitions with corresponding standard error of the mean.
