an infant suffering from haemolytic disease of the newborn

an antigen occurring on the red blood cells of many humans (around 85 per cent) and some other primates. It is particularly important as a cause of haemolytic disease of the newborn and of incompatibility in blood transfusions

a small brown macaque with red skin on the face and rump, native to southern Asia. It is often kept in captivity and is widely used in medical research

lacking the rhesus factor