A novel DNA sequence element termed the J element involved in the regulated expression of class II major histocompatibility complex genes was recently described .
a novel dna sequence element termed the j element involved in the regulated expression of class ii major histocompatibility complex genes was recently described .
O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O B-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group O O O O