Two mutants displayed differential activity between the two promoters , activating transcription with the W-X-Y but not the X-Y elements .
two mutants displayed differential activity between the two promoters , activating transcription with the w-x-y but not the x-y elements .
O O O O O O O O B-DNA_family_or_group O B-other_name I-other_name O O O O O O O O O