Table 3. Increase in EROD activity^a measured in HepG2 and A549 cells exposed to B[a]P from 0.2 to 5 µM.

B[a]P (µM)	0	0.2	2	5
A549	0.00±0.08	0.28±0.08	0.46±0.11	0.59±0.17
HepG2	0.00±0.05	0.30±0.11	3.49±0.61	7.25±0.45

Exposure time was 24 h for HepG2 and 48 h for A549.

a: expressed in pmol of product/min/mg of protein. The average background measured in untreated cells value was subtracted.