What is a blood group?
Blood is made up of red blood cells, white blood cells and platelets in a liquid called plasma.
Proteins found in plasma are called Antibodies and they are part of human body's natural defences. They recognise foreign substances, such as germs, and alert your immune system, which destroys them.
On the surface of red blood cells, there are protein molecules called Antigens.
A blood group (or blood type) is identified by the presence and absence of concrete antibodies and antigens in the blood and is determined by the genes inherited from both parents of an individual.
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