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ABO blood group system is invented by Karl Landsteiner. The blood groups are determined by the presence of antigen on the surface of RBCs.

The following table shows the detailed information about ABO blood group system:

ABO blood group system
BLOOD GROUP ANTIGEN ON RBC ANTIBODIES IN SERUM RECEIVES BLOOD FROM
        A          A            b            A and O
        B          B            a            B and O
       AB        A, B          NONE      A, B, AB and O
        O       NONE           a, b         ONLY FROM O

NOTE: ABO BLOOD GROUP IS CATEGORISED INTO FOUR TYPES VIZ. A, B, AB  AND O.

AB IS THE UNIVERSAL RECIPIENT AS IT CAN RECEIVES BLOOD FROM ALL THE REMANING THREE BLOOD GROUPS BUT IT CAN DONATE ITS BLOOD ONLY TO AB

O IS THE UNIVERSAL DONOR AS IT DONET BLOOD TO ALL THE REMANING THREE BLOOD GROUPS BUT ACCEPTS ONLY FROM O.enlightened

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