sera from 23 patients with drug-induced lupus erythematosus ( procainamide 19 , isoniazid 2 , nitrofurantoin 2 ) and 20 patients with idiopathic ( not drug-induced ) systemic lupus erythematosus ( sle ) were studied .
C0033216
procainamide
C0024141
systemic lupus erythematosus