It is world's most rare blood type, known as the golden or Rh-null blood type. Rh antigens in the red blood cells is what causes blood to appear as red, however, people with Rh-null blood lack ...
There are ABO antigens, which designate ABO blood types. This is determined by the ABO gene. For example: There are also Rhesus (Rh) antigens, which determine if blood is "positive" or "negative." ...