| http://www.w3.org/ns/prov#value | - t) type B (antigen B present, but antigen A absent) third reaction labelled C (both antigens A and B are absent) this was why many blood transfusions failed. people had already realized that animal blood could not be transfused with the patient, but not about the different types of blood (A, B, AB, and O) so many patients died because they werent lucky enough to have the same blood type transfused
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