Thus , IL-2 -induced IL-2R alpha promoter activity requires a complex upstream element , which appears to contain binding sites for both positive and negative regulatory factors .
thus , il-2 -induced il-2r alpha promoter activity requires a complex upstream element , which appears to contain binding sites for both positive and negative regulatory factors .
O O B-protein_molecule O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O