To investigate the activity of a single transcription factor in individual viable cells , we have applied an assay that uses the fluorescence-activated cell sorter to quantitate beta-galactosidase ( beta-gal ) .
to investigate the activity of a single transcription factor in individual viable cells , we have applied an assay that uses the fluorescence-activated cell sorter to quantitate beta-galactosidase ( beta-gal ) .
O O O O O O O B-protein_family_or_group I-protein_family_or_group O B-cell_type I-cell_type I-cell_type O O O O O O O O O O O O O O B-protein_molecule O B-protein_molecule O O