0-78% 38.80% Antibodies to specific (Extractable) Nuclear Antigens (ENA)/Proteins dsONA Sm(Smith) SS A (R0) 55 8 (La) 55 B (La) scl-70 7o-1 Centromere US nRNP Histone Proteins Characteristic of SLE. Rare in other CTDs. Highly associated with active disease. Highly specific for SLE. Uncommon in