Binding of 1EP (part A), B[a]P (part B), and DB[a,j]Ac (part C) with P450 1A1 (open circles,○), P450 1A2 (closed circles, ●), and P450 1B1 (closed squares, ■). Experimental details are as in the legend to Figure 6, except that excitation and emission wavelengthes were set at 277 and 406 nm for 1EP and at 285 and 440 nm for DB[a,j]Ac, respectively. The enzyme and inhibitor concentrations used were 10 nM and the temperature was 25 °C.