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Lutheran antigen system : ウィキペディア英語版 | Lutheran antigen system Lutheran blood group system classification of human blood based on the presence of substances called Lutheran antigens on the surfaces of red blood cells. There are 19 known Lutheran antigens, all of which arise from variations in a gene called BCAM(basal cell adhesion molecule). The system is based on the expression of two codominant alleles, designated Lua andLub. The antigens Aua and Aub, known as the Auberger antigens, were once thought to make up a separate blood group but were later shown to be Lutheran antigens arising from variations in the BCAM gene. The phenotypes Lu(a+b−) and Lu(a+b+) are found at various frequencies within populations. The Lu(a−b+) phenotype is the most common in all populations, whereas the Lu(a−b−) phenotype is extremely uncommon. Though present in the fetusa is seldom the cause of erythroblastosis fetalis or of transfusion reactions. ==External links==
* (Lutheran ) at BGMUT Blood Group Antigen Gene Mutation Database at NCBI, NIH
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