The results suggest that a combination of the three proximal cis-acting elements may constitute a minimal region responsible for CTL-specific expression of perforin .
the results suggest that a combination of the three proximal cis-acting elements may constitute a minimal region responsible for ctl-specific expression of perforin .
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 B-other_name I-other_name O B-protein_molecule O