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 · As humans, we believe we evolved from apes and the Rh factor in our blood even derives its name from the Rhesus Macaque But when it comes to the antigens in our blood there's a small percentage of the population with a strange anomaly, leading some to question if Rhnegative blood is alien in origin Where Does Rh Negative Blood Come From?Rh factor, also called Rhesus factor, is a type of protein found on the outside of red blood cells The protein is genetically inherited (passed down from your parents) If you have the protein, you are Rhpositive If you did not inherit the protein, you are Rhnegative The majority of people, about 85%, are Rhpositive Why is Rh factor important? · For example, people with A antigens have type A blood, while those with B antigens have type B blood People with both A and B antigens Did You Know About The Rh Factor Blood Test Seekapor An Educational Companion How to write blood group with rh factor