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Which blood group system did Landsteiner co-discover later in his career?

  • ABO

  • MN

  • P

  • Rh

Answer

The Rh blood group system, discovered by Landsteiner and Wiener in 1940, is the second most important blood group system after ABO. It is determined by the presence or absence of specific antigens on the surface of red blood cells, with the most significant antigen being the Rh factor (RhD). Rh-positive individuals have the RhD antigen, while Rh-negative individuals lack it.
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