tokens: Coexpression of alpha B1 and alpha B2 showed that the promoter activity could be determined by the alpha B1 /alpha B2 ratio .
folded_tokens: coexpression of alpha b1 and alpha b2 showed that the promoter activity could be determined by the alpha b1 /alpha b2 ratio .
labels: O O B-protein_subunit I-protein_subunit O B-protein_subunit I-protein_subunit O O O B-other_name I-other_name O O O O O B-protein_subunit I-protein_subunit B-protein_subunit I-protein_subunit O O