The ZEBRA activation region was replaced with the potent acid activation region from the herpes simplex virus VP16 protein or with the activation region of the EBV R protein .
the zebra activation region was replaced with the potent acid activation region from the herpes simplex virus vp16 protein or with the activation region of the ebv r protein .
O B-protein_molecule O O O O O O O B-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region O O B-virus I-virus I-virus O O O O O B-protein_domain_or_region I-protein_domain_or_region O O B-protein_molecule I-protein_molecule I-protein_molecule O