What are blood types? What is the Rh factor?
Before Nobel Prize awarded Karl Landsteiner discovered the ABO human blood groups in 1901, it was thought that all blood was the same.
This misunderstanding led to fatal blood transfusions.
Later, in 1940, Landsteiner was part of discovering another blood group, the Rh blood group system.
There are many blood group systems known today, but the ABO and the Rh blood groups are the most important ones used for blood transfusions.
(The designation Rh is derived from the Rhesus monkey in which the existence of the Rh blood group was discovered.)
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