tokens: These studies suggest that the divergent X2-box of the class II major histocompatibility complex promoters plays an important role in influencing differential expression of the human class II isotypes .
folded_tokens: these studies suggest that the divergent x2-box of the class ii major histocompatibility complex promoters plays an important role in influencing differential expression of the human class ii isotypes .
labels: O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O B-protein_complex I-protein_complex I-protein_complex I-protein_complex I-protein_complex O O O O O O O B-other_name I-other_name O O B-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group O