tokens: The gene has 41 small exons spanning 45 kb of genomic DNA and encoding a 5 . 5 kb mRNA .
folded_tokens: the gene has 41 small exons spanning 45 kb of genomic dna and encoding a 5 . 5 kb mrna .
labels: O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_family_or_group I-DNA_family_or_group O O O B-RNA_molecule I-RNA_molecule I-RNA_molecule I-RNA_molecule I-RNA_molecule O