Early in everyday life, your immune system types antibodies towards A or B antigens not existing on the crimson blood cells. The blood group is decided by the type of antigens and antibodies existing while in the red blood cells. Also, the presence or absence of your rhesus issue (Rh) https://b-cubensis-time-lapse09642.theisblog.com/36976078/the-best-side-of-b-cubensis-substrate