One such cofactor , BOB . 1/OBF . 1 , was recently isolated from human B cells .
one such cofactor , bob . 1/obf . 1 , was recently isolated from human b cells .
O O B-protein_family_or_group O B-protein_molecule I-protein_molecule I-protein_molecule I-protein_molecule I-protein_molecule O O O O O B-cell_type I-cell_type I-cell_type O