tokens: The human IL-4 gene , of 10 kilobases , is composed of four exons and three introns .
folded_tokens: the human il-4 gene , of 10 kilobases , is composed of four exons and three introns .
labels: O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O B-polynucleotide I-polynucleotide O O O O O B-DNA_domain_or_region O O B-DNA_domain_or_region O