Mondo Knows Facts
The rhesus factor is one protein on red cells
People are RhD positive or negative depending on whether this surface protein is present The Rh system involves several antigens, but the D antigen matters most in practice. RhD positive means the protein is present on red cells, and negative means it is absent. The positive state is more common in most populations, though frequencies vary widely around the world. It sits in Mondo's human body collection, one of 200 facts that each trace back to the reference below.
Where this comes from
American Society of Hematology
Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.
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Tags: blood, rhesus, antigens
The rhesus factor is one protein on red cells: the short answers
- Where does this come from, and can I check it?
- People are RhD positive or negative depending on whether this surface protein is present. The figure is taken from American Society of Hematology, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
- Is this really a human body fact?
- Yes. It sits on the Human Body shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
- What else can I read about it?
- The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.