bn:00041949n
Noun Concept
Categories: Blood antigen systems, Transfusion medicine, Serology, Antigenic determinant, Genes on human chromosome 9
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O  type O  group O
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The blood group whose red cells carry neither the A nor B antigens WordNet 3.0
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The blood group whose red cells carry neither the A nor B antigens WordNet 3.0 & Open English WordNet
A blood type that lacks A or B antigens and may only receive transfusions of similar type O blood, but may donate to all (neglecting Rh factor). Synonym: universal donor. Wiktionary
A vocative particle. Wiktionary (translation)
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People with type O blood are universal donors WordNet 3.0 & Open English WordNet
WordNet 3.0 & Open English WordNet
Wiktionary
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O
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