Question
What is the Rh-factor?
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Answer
The Rh-factor was first discovered in the Rhesus monkey. It was found that Rh (rhesus) antigens were causing many of the transfusion failures that were unexplained by the A-B-O system. There are at least eight different Rh antigens so far. The person bearing Rhfactor is $Rh ^{+ ve }$ and a person who does not possess this factor is $Rh ^{- ve }$.
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