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Human beings have four major blood types, A, B, AB and O.
Blood cells, like all cells, are covered with molecules called ‘antigens', which depend on our genes. If we transfuse the blood of a certain antigen into a person with a different one, the immune system...
Identified by Dr Karl Landsteiner in 1901, the most common antigens are A and B, and a person with type O blood has neither of the antigens, while some have both of them (Type AB).
Another antigen called RhD was discovered in 1937.
Currently, we have 36 system...
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