Individually or collectively , none of the three enhancer-binding proteins ( LEF-1 , Ets-1 , and TFE-3 ) could activate transcription in the absence of Sp1 .
individually or collectively , none of the three enhancer-binding proteins ( lef-1 , ets-1 , and tfe-3 ) could activate transcription in the absence of sp1 .
O O O O O O O O B-protein_family_or_group I-protein_family_or_group O B-protein_molecule O B-protein_molecule O O B-protein_molecule O O O O O O O O B-protein_molecule O