sera of patients with systemic lupus erythematosus and related autoimmune diseases often possess anti-sm and anti-ribonucleoprotein ( rnp ) autoantibodies that recognize antigenic sites on small nuclear ( sn ) rnps containing the snrnas u1 , u2 , u4 , u5 , and u6 .
C0024141
systemic lupus erythematosus
C0004364
autoimmune