Table 2

Effects of prenylated flavonoids on the mutagenicity of IQ(6 ng/plate) activated by cDNA-expressed human CYP1A2 in Salmonella typhimurium TA98

Treatment	Flavonoid Concentration	Number of Revertants per plate^2-a
	nmol/ml top agar
Control (ethanol)	0	3059 ± 387
8PN	2	191 ± 30.9^2-b (93.8)
	10	4.7 ± 4.7^2-b (99.9)
XN	2	1579 ± 82.3^2-b (48.4)
	10	364 ± 43.2^2-b (88.1)
IX	2	499 ± 4.9^2-b (83.7)
	10	189 ± 9.8^2-b (93.8)

↵2-a Values are means ± S.E. of triplicate plates and have been corrected for spontaneous revertants (58 ± 10). Values in parentheses are percent inhibition as compared with control.
↵2-b P < .05 versus control (Student's t test).