define ====== >>>>>>>>Rh-factor
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Rhesus (Rh) factor is an inherited protein found on the surface of red blood cells. Rh factor is a blood protein that plays a critical role in some pregnancies. People without Rh factor are known as Rh negative, while people with the Rh factor are Rh positive.If your blood has the protein, you're Rh positive. If your blood lacks the protein, you're Rh negative. Rh positive is the most common blood type.
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