By contrast , UAS1 ( -140 to -87 ) was B cell specific and was the key determinant of the promoter's increased activity in B cell lines .
by contrast , uas1 ( -140 to -87 ) was b cell specific and was the key determinant of the promoter's increased activity in b cell lines .
O O O B-DNA_domain_or_region O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O O O O O O O O O B-cell_line I-cell_line I-cell_line O