Assertion: periwinkle's alkaloid | /r/CapableOf | show potent inhibition of cyp2d6
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Source sentences:
text: An in vitro study evaluated the effect of periwinkle alkaloids on the cytochrome (CYP) P450 enzyme system, and some isolated alkaloids showed potent inhibition of CYP2D6, but weak activity against CYP3A4.38