ABO blood group system

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Related to ABO blood system: universal donor

ABO blood group system

[‚ā‚bē′ō ′bləd ‚grüp ‚sis·təm]
(immunology)
A set of multiple alleles found on a single locus on human chromosome 9 that specifies the presence or absence of certain red cell antigens, which determines the ABO blood group.