Recent studies , however , demonstrate that the transcribed 5'-untranslated leader region ( 5'-UTR ) also contains important transcriptional elements .
recent studies , however , demonstrate that the transcribed 5'-untranslated leader region ( 5'-utr ) also contains important transcriptional elements .
O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region O O O O B-DNA_family_or_group I-DNA_family_or_group O