Oct-1 and Oct-2 can bind specifically to a site at base pair -55 in vitro , and this site is specifically protected in B cells in vivo .
oct-1 and oct-2 can bind specifically to a site at base pair -55 in vitro , and this site is specifically protected in b cells in vivo .
B-protein_molecule O B-protein_molecule O O O O O O O O O O O O O O O O O O O O B-cell_type I-cell_type O O O