Rh-factor derives its name from

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Rhesus Monkey. Rh antigen similar to one present in Rhesus monkey (hence Rh) is also observed on the surface of the RBCs of majority (nearly 80%) of humans. Such individuals are called Rh positive (Rh+ve) and those in whom this antigen is absent are called Rh Negative (Rh–ve). An Rh (–ve) person, if exposed to Rh+ve blood, will form specific antibodies against the Rh antigens. Therefore, Rh group should also be matched before transfusions. It was discovered in 1940 by Landsteiner and Wiener.

Rh-factor derives its name from

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