title: Discordance in a pair of identical twin carriers of factor IX deficiency.
abstract: Female twin daughters of a man with hemophilia B were determined to be identical but widely discordant with respect to their degree of factor IX deficiency. The proposita had a marked deficiency (3%) of factor IX with clinical bleeding. She became pregnant. Delivery was managed with infusion of factor IX concentrates. These twins represent the second reported case of identical twins with discordant factor IX levels.
authors.forename: C S
authors.initials: CS
authors.lastname: Kitchens
mesh_terms: D000328:Adult; D004200:Diseases in Twins / Q000097:blood / Q000235:genetics*; D004303:Dosage Compensation, Genetic; D005164:Factor IX / Q000032:analysis; D005260:Female; D005819:Genetic Markers; D002836:Hemophilia B / Q000097:blood / Q000235:genetics*; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011250:Pregnancy Complications, Hematologic / Q000097:blood / Q000235:genetics*; D014427:Twins; D014430:Twins, Monozygotic
chemical_list: D005819:Genetic Markers; D005164:Factor IX