Type A blood means that antigen A can be found in the red blood cells, and antigen B is in the plasma of the blood. Type B, on the other hand, means that antigen B is in the red blood cells, and antigen A is in the plasma.
People can also have type AB blood, which means that their red blood cells both contain antigen A and antigen B, and none are present in plasma. The inverse of this is type O blood, wherein there are no antigens in the red blood cells, but the plasma has both antigen A and antigen B.
There is also a type of protein, the Rh factor, which is another factor when it comes to our blood types. The presence of the Rh factor is symbolized by a (+) symbol, and the absence of it by a (-) symbol.
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