Blood types

What Is Your Blood Type? What to Know About A, B, AB, and O blood type Blood Groups Four major blood groups: A, B, AB and O These four blood groups were originally identified by Karl Landsteiner in 1900 Your blood group is blood type Blood Groups Four major blood groups: A, B, AB and O These four blood groups were originally identified by Karl Landsteiner in 1900 Your blood group is

blood link A blood protein which was discovered in 1940 Those who have this Rhesus factor on their red blood cells are considered Rh positive Those who lack the factor