BBS1005_Case 7_Fetus recognition by maternal immune system.Exam Graded A+ with Updated 100% solutions.1. How does the maternal immune system prevent rejection of the fetus? (Regulatory T cells, APC’s, Histocompatibility, CD80, perforins, IL10, natural killer cells, HLA, receptors, ACD56 ?, macrophages, antigens, allogenic, barriers) The immune system of the mother is non-responsive towards the semi-allogeneic fetus. Semiallogenic means that Half of fetus’s HLA genes come from the father, so the fetus