Rhesus factor or Rh factor
Rh factor is an antigen present on the red blood cells. This antigen was first discovered in Rhesus monkey. The persons having Rh factor are called Rh positive (Rh+). And the persons not having Rh factor are called Rh negative (Rh-). About 85% humans are Rh positive. An Rh negative mother may lose her baby if the mother has Rh positive baby.
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