Christmas disease in one of a pair of monozygotic twin girls, possibly the effect of lyonization.
D001780:Blood Coagulation Tests; D001789:Blood Group Antigens; D004200:Diseases in Twins; D005260:Female; D002836:Hemophilia B / Q000235:genetics*; D006579:Heterozygote; D006648:Histocompatibility; D006801:Humans; D007223:Infant; D007959:Lymphocyte Culture Test, Mixed; D010375:Pedigree; D012730:Sex Chromosomes
D001789:Blood Group Antigens