The skin basement membrane of sufferers of this disease often shows a band of IgM. The presence of aprotein named for and associated with this disease is found via the Dilute Russell's viper venom time.People with slow N-acetyltransferase are susceptible to a form of this disease caused by drugs likeprocainamide. This disease causes Libman-Sacks endocarditis and a form of 
The skin basement membrane of sufferers of this disease often shows a band of IgM. The presence of aprotein named for and associated with this disease is found via the Dilute Russell's viper venom time.People with slow N-acetyltransferase are susceptible to a form of this disease caused by drugs likeprocainamide. This disease causes Libman-Sacks endocarditis and a form of nephritis with wire-loopabnormalities. This disease is partly caused by a break in tolerance caused by continuous exposure toapoptotic products of lymphocytes. This disease often presents with anti-Smith and anti-nuclear antibodies,and patients are hypersensitive to sunlight. For 10 points, name this autoimmune disease with acharacteristic butterfly rash on the face.
The skin basement membrane of sufferers of this disease often shows a band of IgM.
lupus [accept systemic lupus erythromatosis or SLE]