指新生动物从母体获得的被动免疫力。人和其他灵长类动物的母体免疫主要通过IgG抗体（能主动通过胎盘）而获得，也可由初乳获得。对于有蹄类动物，因为抗体不能通过胎盘转输给幼仔，但可从初乳获得。禽类中的幼雏可接受IgY从而获得母体免疫。
人类母乳中的母体蛋白质，能促进婴儿的健康和提高其对疾病的免疫力。
Proteins produced by mother, and found in human mother's breast milk, serve to promote an infant's health and immunity from disease.
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.
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