the hybrid cells were characterized by indirect immunofluorescence with a biotin-streptavidin system using a panel of nine monoclonal antibodies specific for membrane and cytoplasmic antigens of parental cells : intermediate filaments ( keratins and vimentin ) , hla class 1 ( beta 2-microglobulin ) , cell activation ( egf and transferrin receptors ) and cellular adhesion ( fibronectin and laminin ) .
C0021770
intermediate filaments
C0042666
vimentin