BSAP has been identified previously as a transcription factor that is expressed at early , but not late , stages of B-cell differentiation .
bsap has been identified previously as a transcription factor that is expressed at early , but not late , stages of b-cell differentiation .
B-protein_molecule O O O O O O B-protein_family_or_group I-protein_family_or_group O O O O O O O O O O O O B-other_name I-other_name O