sera from patients with rheumatoid arthritis ( ra ) , patients with infectious mononucleosis ( im ) , and blood donors were tested by indirect immunofluorescence for the presence of antikeratin antibody ( aka ) , antibody to cytoskeletal intermediate filaments of prekeratin or vimentin type ( aifa ) and antiperinuclear factor ( apf ) .
C0021770
cytoskeletal
C0042666
vimentin