Both limiting-component transcription assays and DNA binding assays identified the class III gene transcription factor TFIIIB as the principle target of Tax activity .
both limiting-component transcription assays and dna binding assays identified the class iii gene transcription factor tfiiib as the principle target of tax activity .
O B-other_name I-other_name I-other_name O B-other_name I-other_name I-other_name O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group B-protein_molecule O O O O O B-protein_molecule O O