Fig. 1

Age-related constitutive and β-naphtoflavone-inducible expression of CYP1A1 mRNA in rat small intestine. Values are expressed as mean integrated optical density (IOD) ± S.D. Significant difference at **P < 0.01 and *P < 0.05 versus control immature 2-week-old rats, at ^† P < 0.05 versus control 2-month-old rats, at filled circle P < 0.05 versus control 4-month-old rats, at ^## P < 0.001 and ^# P < 0.05 versus induced 2-week-old animals and at filled double diamond P < 0.01 and filled diamond P < 0.05 versus induced 2-month-old individuals