We show that the myeloid and B cell transcription factor PU . 1 binds specifically to this site .
we show that the myeloid and b cell transcription factor pu . 1 binds specifically to this site .
O O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group B-protein_molecule I-protein_molecule I-protein_molecule O O O O O O