ABO BLOOD GROUPS

ABO BLOOD GROUPS
There are four types of blood groups in human beings: A, B, AB and O.
These are based on types of proteins on the cell membrane of red blood cells.
There are two types of proteins denoted by the letters A and B which are antigens.
In the plasma are antibodies specific to these antigens denoted as a and b.
A person of blood group A has A antigens on the red blood cells and b antibodies in plasma.
A person of blood group B has B antigens on red blood cells and a antibodies in plasma.