tokens: PU . 1 mRNA expression and PU . 1 DNA binding activity , as measured by Northern blot analysis and electrophoretic mobility shift assay , respectively , were evident in cell lines representing pro-B , pre-B , and mature B cells .
folded_tokens: pu . 1 mrna expression and pu . 1 dna binding activity , as measured by northern blot analysis and electrophoretic mobility shift assay , respectively , were evident in cell lines representing pro-b , pre-b , and mature b cells .
labels: B-protein_molecule I-protein_molecule I-protein_molecule O O O B-protein_molecule I-protein_molecule I-protein_molecule O O O O O O O B-other_name I-other_name I-other_name O B-other_name I-other_name I-other_name I-other_name O O O O O O B-cell_line I-cell_line O O O O O O O O O O