A new exon containing a highly basic region ( 4c ) was characterized , between exons 4 and 5 .
a new exon containing a highly basic region ( 4c ) was characterized , between exons 4 and 5 .
O O B-DNA_domain_or_region O O O O O O O O O O O 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 O