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What are the four blood groups in humans?
In humans, the four blood groups present are A, B, AB and O.
[Extra information for reference:
Human having blood group A possess two possibilities of antigen present in the blood: IAIA or IAIO
Human having blood group B possess two possibilities of antigen present in the blood: IBIB or IBIO
Human with blood group O has no antigen present in the blood: IOIO]
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