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What (who) is B antigen - definition
![codominant]], giving the AB [[phenotype]].](https://commons.wikimedia.org/wiki/Special:FilePath/ABO system codominance.svg?width=200 "codominant]], giving the AB [[phenotype]].")
![[[Ukraine]] marine uniform imprint, showing the wearer's blood type as "B (III) Rh+"](https://commons.wikimedia.org/wiki/Special:FilePath/UkrArmyBloodGroupIII+2000s.jpg?width=200 "[[Ukraine]] marine uniform imprint, showing the wearer's blood type as \"B (III) Rh+\"")
![An illustration that shows how antigens induce the [[immune system]] response by interacting with an [[antibody]] that matches the [[molecular structure]] of an antigen](https://commons.wikimedia.org/wiki/Special:FilePath/Antibody.svg?width=200 "An illustration that shows how antigens induce the [[immune system]] response by interacting with an [[antibody]] that matches the [[molecular structure]] of an antigen")
Wikipedia
The ABO blood group system is used to denote the presence of one, both, or neither of the A and B antigens on erythrocytes. For human blood transfusions, it is the most important of the 43 different blood type (or group) classification systems currently recognized by the International Society of Blood Transfusions (ISBT) as of June 2021. A mismatch (very rare in modern medicine) in this, or any other serotype, can cause a potentially fatal adverse reaction after a transfusion, or an unwanted immune response to an organ transplant. The associated anti-A and anti-B antibodies are usually IgM antibodies, produced in the first years of life by sensitization to environmental substances such as food, bacteria, and viruses.
The ABO blood types were discovered by Karl Landsteiner in 1901; he received the Nobel Prize in Physiology or Medicine in 1930 for this discovery. ABO blood types are also present in other primates such as apes and Old World monkeys.
