Profound immunologic changes occur during pregnancy, involving a polarization of t helper cells towards a dominance of Th2 and regulatory t cell effector responses in both mother and fetus.

意义深远的免疫性的改变发生在怀孕期间，对于在母亲和胎儿中多数的th2和调整的t细胞效应器都反映包括了th细胞的极化。

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In it, Akin explained his opposition by citing unnamed bodily responses that he said prevented pregnancy.

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Glynn said the study also showed that emotional responses to stress are greater earlier in pregnancy.

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She has chosen 51 genes to study, including those involved in the body's responses to stress and infection, in hormonal changes related to pregnancy, and in ways in which the body handles a wide variety of environmental toxins.

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