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And in rats, such methylation makes young animals especially sensitive to stress, and also fearful of novelty.

而老鼠试验表明，这样的甲基化过程让幼小动物对压力尤其敏感，对新鲜事物也感到恐惧。

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The new study, done on rats, finds females are more sensitive to low levels of an important stress hormone and less able to adapt to high levels of it than males.

这项新研究是用老鼠来进行的，发现雌老鼠对一种重要的应激激素，即使低水平也比雄老鼠更为敏感；也就是说，相对来说，雌老鼠不能够适应这种激素的高水平。

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To be sure, people who are innately sensitive to stress don't always become overreactive.

WSJ: Are You Hard-Wired to Boil Over From Stress?

In some countries the suicide rate seemed especially sensitive to economic stress.

CNN: European suicides spiked during economic crisis