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RT-PCR validation of CYP expression levels. Samples were analyzed by RT-PCR using primers described in Table 1. CAPE indicates rats killed 12 hours after CAPE dosing; D + C24, killed 24 hours after DEN dosing with CAPE pretreatment 12 hours before DEN (n = 4 in each group); D24, killed 24 hours after DEN dosing; NT, untreated. *P < .05 compared with NT, **P < .05 compared with D24 by Student's t test.
