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October 19th, 2013, 01:57 PM
MindyKana MindyKana is offline
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Join Date: Oct 2013
Posts: 41
Quote:
You are probably somewhat familiar with blood types. Your mom may have told you that you were O+ or B-, etc. Blood is grouped into A, B, AB, or O and also by the Rh factor, either negative or positive. Most people are Rh positive. This means they have an antigen on their red blood cells for the Rh factor. People without the Rh factor antigen are Rh negative.
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