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1:05
YouTube
Daniel Izzo
How the Body Works : The Rh Factor
The Rh Factor There are many different blood groups of which the two most important are the ABO and the Rhesus or Rh groupings. More than 85 percent of the world's population possess the Rh antigen in their blood---and are considered Rh positive. In all other individuals the antigen is lacking and they are classified as Rh negative. Should the ...
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