科学家们对此是这样解释的，母体在生育每个男性胎儿时，会为男性胎儿产生的抗原培育出一套增强的免疫系统，而这种抗原很可能在大脑的男性化过程中发挥着重要作用。
Scientists explain that, with each male fetus, a mother develops an increased immunization to an antigen produced by the male fetuses, and this antigen likely plays a role in masculinizing the brain.
尤其是在定向造血干细胞(所有免疫系统细胞的母体)中找到了病毒。
Specifically, they found the virus in hematopoietic progenitor cells (HPCs) -the mother of all immune system cells.
他进一步指出，这些研究发现的另类解释是，怀孕可能会以促进肿瘤生成的方式影响母体的免疫系统。
An alternative explanation for these findings is that pregnancy may somehow affect the maternal immune system in a way that encourages tumor growth, he said.
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