Red blood cells contain chemical compounds which combine in different ways to determine a person’s blood group. There are four major groups: O, A, B and AB of which 88% are Rh positive and 12% are Rh negative.
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Red blood cells contain chemical compounds which combine in different ways to determine a person’s blood group. There are four major groups: O, A, B and AB of which 88% are Rh positive and 12% are Rh negative.