The Rh blood group system was discovered by Karl Landsteiner and Alexander S. Wiener. With whose blood were they experimenting?

Karl Landsteiner
Karl Landsteiner's sick daughter
Prisoners of Auschwitz
Rhesus Macaque
"Rh" stands for "Rhesus". Due to its relatively easy upkeep in captivity and anatomical closeness to humans, rhesuses have been used extensively in medical research.
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Karl Landsteiner
Karl Landsteiner's sick daughter
Prisoners of Auschwitz
Rhesus Macaque
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flagthe United Arab Emirates
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