Each serum contained antibodies to a different set of epitopes , which taken together cover most of the HBx sequence .
each serum contained antibodies to a different set of epitopes , which taken together cover most of the hbx sequence .
O B-tissue O B-protein_family_or_group O O O O O B-protein_domain_or_region O O O O O O O O B-protein_molecule I-protein_molecule O