An upstream segment contains tandem dinucleotide repeats ( CT ) 19/ ( CA ) 16 .
an upstream segment contains tandem dinucleotide repeats ( ct ) 19/ ( ca ) 16 .
O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O