Concept
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Population Genetics
ABO blood type in humans
In humans, each blood type corresponds to a combination of two alleles, which represent a the type of antigens displayed on the outside of a red blood cell. Human blood types are A, B, AB, and O.
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"ABO Blood type."
http://en.wikipedia.org/wiki/ABO_blood_group_system%23mediaviewer/File:ABO_blood_type.svg
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