Some people even have a genetic defect in the enzymes in their liver that break down nicotine, whereby the mutant enzyme is much less effective at metabolizing nicotine than the normal variant.

有些人的肝脏中分解尼古丁的酶有遗传上的缺陷，因此这种突变的酶在代谢尼古丁时的作用就比正常的变异体的作用小。

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The variant subtilases exhibit improved wash performance in a detergent in comparison to its parent enzyme.

所述枯草杆菌酶在洗涤剂中的洗涤性能相比于其亲本酶 有所改良。

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In the third study, which also looked at children in New York City, researchers found that the association between organophosphate exposure and developmental delays was more pronounced in children whose mothers had a certain genetic variant that influences an enzyme that breaks down organophosphates.

CNN: Pesticide exposure in womb may hurt your child's IQ