A unique region containing four or five near-perfect direct repeats ( DR ) of 21 bp with one 12-bp insert was proven to be the main transcription-activation element , with enhancer-like characteristics .
a unique region containing four or five near-perfect direct repeats ( dr ) of 21 bp with one 12-bp insert was proven to be the main transcription-activation element , with enhancer-like characteristics .
O O O O O O O O B-DNA_substructure I-DNA_substructure O B-DNA_substructure O O B-polynucleotide I-polynucleotide O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O B-other_name I-other_name O