tokens: The E2F family of transcription factors are thought to play an important role in the control of cell cycle progression .
folded_tokens: the e2f family of transcription factors are thought to play an important role in the control of cell cycle progression .
labels: O B-protein_family_or_group I-protein_family_or_group O B-protein_family_or_group I-protein_family_or_group O O O O O O O O O O O B-other_name I-other_name I-other_name O