tokens: Several cis-acting regulatory sites are required for induction of the IL-2 gene after stimulation .
folded_tokens: several cis-acting regulatory sites are required for induction of the il-2 gene after stimulation .
labels: O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O O B-protein_molecule O O O O