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Red Blood Cells (RBC) carry proteins on their surfaces in addition to the "A" and "B" antigens. The Rhesus factor, or Rh, is a protein carried by some individuals. If a person's RBCs carry the Rh factor, they are consider to be "Rh positive (Rh+)". If not, they are " Rh negative (Rh-)". Rh is a domain trait so only one allele is needed to be Rh+.
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Rhesus (Rhfactor is an inherited protein found on the surface of red blood cells. 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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