[color=#444444]第一类观点担心基因决定论将减弱人们的决心。

[color=#444444]The first involves the fear that genetic determinism cheapens human volition.

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与之相反，L -甲硫氨酸增加了甲基化水平，从而减弱了正常老鼠中糖皮质激素受体基因的表达，导致了恐惧、焦虑和对压力的强烈反应。

By contrast, L-methionine increased the level of methylation and thus reduced the expression of the gene in animals with loving mothers, and led to fear, anxiety and a heightened response to stress.

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经证实，这种做法比期望要困难许多，因为如果一种疾病由多种基因致使，那么单一基因的讯号就不可避免地被减弱。

This has proved a lot harder than expected, because if lots of genes contribute to a disease, the signal from each is inevitably weakened.

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