Inhibition of human microsomal CYP1A1 catalytic activity by eight anthocyanins and proanthocyanidin A2 (PAC) expressed as the amount of activity remaining relative to control (without anthocyanin) in percent. Concentration of respective anthocyanins in the reaction mixture was 0, 10, 20, 40, 80 and 100 µM. For experimental details, see the Methods section.