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CYP3A4 and CYP3A5 require cytochrome b5 (b5) and NADPH-cytochrome P450 oxidoreductase (CPR) for optimum metabolism, but little is known about the specific requirements for b5 and CPR to produce optimal activities for these enzymes. The metabolism of testosterone (TT) by CYP3A4 and CYP3A5 was analyzed by various combinations of b5 and CPR using a fixed amount of recombinant P450 which had been purified...
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