This is the first description , to our knowledge , of regulatory elements that control expression of a gene encoding a B7 costimulatory molecule .
this is the first description , to our knowledge , of regulatory elements that control expression of a gene encoding a b7 costimulatory molecule .
O O O O O O O O O O O B-DNA_family_or_group I-DNA_family_or_group O O O O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O