tokens: In addition Spi-B as well as PU . 1 were able to transactivate Btk expression .
folded_tokens: in addition spi-b as well as pu . 1 were able to transactivate btk expression .
labels: O O B-protein_molecule O O O B-protein_molecule I-protein_molecule I-protein_molecule O O O O B-protein_molecule O O