Landsteiner, Karl

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Landsteiner, Karl (1868–1943) US pathologist, b. Austria. Landsteiner discovered the four different blood groups (A, B, AB, and O) and demonstrated that certain blood groups are incompatible with others. He received the 1930 Nobel Prize in physiology or medicine. In 1940, with A. S. Wiener, he identified the rhesus (Rh) factor in blood.

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