“Rats pretreated with classical cytochrome P450 inducers (Aroclor 1254, 3-methylcholanthrene, phenobarbital, dexamethasone and ciprofibrate ) or with flavonoids (flavone, flavanone, quercetin and tangeretin) resulted in increased microsomal demethylation of tangeretin after 3-methylcholanthrene and flavone only.”