tokens: A transcription start site is located approximately 4 kilobases 5' to the translation initiation codon , and an RNA splice of 3863 bases occurs in the 5'-untranslated region to generate mature HeLa cell mRNA .
folded_tokens: a transcription start site is located approximately 4 kilobases 5' to the translation initiation codon , and an rna splice of 3863 bases occurs in the 5'-untranslated region to generate mature hela cell mrna .
labels: O O O O O O O B-polynucleotide I-polynucleotide O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O B-other_name I-other_name O B-polynucleotide I-polynucleotide O O O B-DNA_domain_or_region I-DNA_domain_or_region O O B-RNA_family_or_group B-cell_line I-cell_line O O