Consequently, the autoimmune antibody, fluorescently labeled modified aerolysin (FLAER), CD55\CD59 expression, and direct antiglobulin (Coombs) tests were not abnormal, which ruled out paroxysmal nocturnal hemoglobinuria (PNH) and autoimmune hemolytic anemia. The gene discussed is CD55; the disease is paroxysmal nocturnal hemoglobinuria.