tokens: The human IL-13 gene was located 12 . 5-kb upstream of the IL-4 gene and 2-kb downstream of a CpG island .
folded_tokens: the human il-13 gene was located 12 . 5-kb upstream of the il-4 gene and 2-kb downstream of a cpg island .
labels: O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O B-protein_molecule O O B-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O