tokens: Retinoblastoma protein ( RB ) is a tumor suppressor and functions as a transcriptional repressor by binding and inactivating the transactivator E2F-I .
folded_tokens: retinoblastoma protein ( rb ) is a tumor suppressor and functions as a transcriptional repressor by binding and inactivating the transactivator e2f-i .
labels: B-protein_family_or_group I-protein_family_or_group O B-protein_molecule O O O B-other_name I-other_name O O O O B-protein_family_or_group I-protein_family_or_group O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O