although the cellular localizations and intercellular distributions of cytochromes p-450 bnf-b and mc-b parallel those of benzo [ a ] pyrene hydroxylase activity within the different segments of the respiratory tract in untreated rats , immunohistochemical findings on the inductions of these cytochrome p-450 isozymes are not entirely consistent with histochemical observations on the enhancement of benzo [ a ] pyrene hydroxylase activity by aroclor 1254 within the nasal mucosa and by both aroclor 1254 and 3-methylcholanthrene within the lung .
C0035237
respiratory tract
C0024109
lung