Only a small region ( -35 to +22 ) including the Sp1 element and transcription start site , but not the PU . 1 site was footprinted .
only a small region ( -35 to +22 ) including the sp1 element and transcription start site , but not the pu . 1 site was footprinted .
O O O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O