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Human CYP2C9-Arg expressed in the microsomes of human B lymphoblastoid cells efficiently catalyzed the 11-hydroxylation of Δ<sup>8</sup>-THC (7.60 nmol/min/nmol CYP), Δ<sup>9</sup>-THC (19.2 nmol/min/nmol CYP) and CBN (6.62 nmol/min/nmol CYP). Human CYP3A4 expressed in the cells catalyzed the 7α-(5.34 nmol/min/nmol CYP) and 7β-hydroxylation (1.39 nmol/min/nmol CYP) of Δ<sup>8</sup>-THC, the 8β-hydroxylation (6.10 nmol/min/nmol CYP) and 9α,10α-epoxidation (1.71 nmol/min/nmol CYP) of Δ<sup>9</sup>-THC, and the 8-hydroxylation of CBN (1.45 nmol/min/nmol CYP). These results indicate that CYP2C9 and CYP3A4 are major enzymes involved in the 11-hydroxylation and the 8-(or the 7-) hydroxylation, respectively, of the cannabinoids by human hepatic microsomes. 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