Immunity that targets gamete outcome induces abortion of an embryo while it is within its mother 's reproductive system .
In placental mammals this process of gestation occurs inside the reproductive system of the mother of the embryo .
Immunity that targets gamete outcome induces abortion of an embryo while it is within system 's mother 's reproductive system .
In placental mammals this process of gestation occurs inside the reproductive system of the mother of the embryo .