immune electron microscopy using a peroxidase-antiperoxidase ( pap ) technique was done on muscle biopsies from patients with scleroderma ( pss ) , rheumatoid arthritis ( ra ) , systemic lupus erythematosus ( sle ) , and normal controls , in order to localize laminin and fibronectin in the muscle capillary basement membrane ( bm ) .
C0022984
laminin
C0004799
basement