title: Mosaicism of red cell ABO type without recognizable cause.
abstract: A 19-year old woman has been found whose red cells are a mixture of groups A1B (60%) and A1 (40%). Tests for many other genetic markers show no other evidence of mosaicism. She is not a twin and her parents and a sib are of normal ABO type. The cause of her dual population of red cells cannot be established, but may be an effect of somatic crossing over or mutation.
mesh_terms: D000017:ABO Blood-Group System / Q000235:genetics*; D000328:Adult; D004912:Erythrocytes / Q000032:analysis*; D005260:Female; D006801:Humans; D009030:Mosaicism; D012463:Saliva / Q000032:analysis
chemical_list: D000017:ABO Blood-Group System