What did Karl Landsteiner identify in the blood?
Antibodies
Hemoglobin
Agglutinins
Plasma cells
Answer
Agglutinins, discovered by Karl Landsteiner, are proteins in the blood plasma that cause clumping of red blood cells when they encounter foreign antigens on the surface of the cells. This reaction forms the basis of blood typing and transfusion compatibility, ensuring safe blood transfusions by matching donor and recipient blood types to prevent immune rejection.
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