Cells in the B series with 4C DNA content ( 100B and 200B ) also differed from the A series 4C cells by the absence of DNA binding by the full-length Sp1 transcription factor .
cells in the b series with 4c dna content ( 100b and 200b ) also differed from the a series 4c cells by the absence of dna binding by the full-length sp1 transcription factor .
O O O O O O O O O O O O O O O O O O B-cell_line I-cell_line I-cell_line I-cell_line O O O O O O O O O B-protein_molecule B-protein_family_or_group I-protein_family_or_group O