these results suggest that the component of the aryl hydrocarbon hydroxylase enzyme system that is responsible for the activation of cyclopenta [ a ] phenanthrenes is specific and not the same as that needed for polycyclic aromatic hydrocarbons , and that hepg2 cells contain a reductase which is specific for the 17-ketone function in the cyclopenta [ a ] phenanthrenes .
C0032458
polycyclic aromatic hydrocarbons
C0031368
phenanthrenes