胎儿及胎盘在子宫内是一个移植物,按照移植物常例,母体是应该将他排斥掉的。不被排斥的原因,尚未了解,一旦阐明之后,对解决同种移植问题,可能有重要启示。孕卵因何能避免免疫细胞的攻击,解释是①蜕膜不能传入免疫的反射,能将孕卵隔离起来,②滋养叶不具备移植抗原或在细胞表面不表现有这种抗原性质,故孕卵能着床。着床之后,胎盘逐渐形成,不被排斥之故有下列的几种解释: 一、胎母血循环完全分离:与同种动物之联体生活者不同、联体生活者正常之结果为联体生活中毒的死亡,人类胎母之关系,则因血不互通,故胎儿能继续生长而不被排斥,血运之直通乃第一次排 The fetus and placenta are a graft in the uterus. According to the usual graft, the mother should exclude him. The reasons for not being excluded are yet to be understood and, once clarified, there may be important implications for the solution of the allograft problem. How to avoid the attack of immune cells immune cells, the explanation is that the decidua can not be introduced into the immune reflex, the eggs can be isolated up, ② nourish the leaves do not have transplantation of antigens or cell surface does not show the nature of this antigen, so Pregnant eggs can be implanted. After implantation, the placenta gradually formed, not excluded, so the following explanations: First, the complete separation of the fetus blood circulation: with the same species of animal life in the United States, the common result of life for the United life The poisoning of death, the relationship between human maternal and child, because the blood is not interlinked, so the fetus can continue to grow without being excluded, blood is the first pass