One form of cytochrome P-450 from phenobarbital-induced marmoset liver was purified to apparent electrophoretic homogeneity and compared with the major inducible form isolated from rat liver. Whereas spectral properties and molecular weights, as well as catalytic activities towards aminopyrine and ethylmorphine N-demethylation are quite similar, rates of O-dealkylation with enzymes from the two species are considerably different. While ethoxycoumarin deethylation for the marmoset cytochrome is about one-fortieth of that for the rat, ethoxyresorufin and even pentoxyresorufin dealkylations for the marmoset form are not detectable. By contrast, aldrin epoxidation as catalyzed by this cytochrome is about three times as high as that obtained from the rat.
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