noun
a classification of blood types into four groups: A, B, AB, and O
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The study of genetics allows us to understand the inheritance patterns of the ABO blood group system.
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My brother and I have different ABO blood groups, which is kind of cool.
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I heard that guy has the rarest ABO blood group, like winning the genetic lottery or something.
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In a way, the ABO blood group can be seen as a genetic signature that distinguishes each individual.