Abstract
1. 1. Arylhydrocarbon hydroxylase activity has been measured in the aortae of two strains of pigeon, the atherosclerosis-susceptible White Carneau and the atherosclerosis-resistant Show Racer. The activity in aortae taken from the rabbit, an atherosclerosis-susceptible species and the rat, an atherosclerosis-resistant species was also studied. 2. 2. Aortic arylhydrocarbon hydroxylase activity was found to be present in both of the atherosclerosis-susceptible species, but absent from both of the atherosclerosis-resistant species. 3. 3. Aortic arylhydrocarbon hydroxylase activity was not induced by 3-methylcholanthrene in any of the species studied.
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