... wt C-strain rE2 protein binding to pig anti -C-strain and anti-QZ-07 sera,respectively. Thus, the binding of the wt C-strain rE2 protein to either of the sera was set at 100%. rE2-BC proteins ... binding efficiency of individual rE2 proteins. For each of the variant C-strain rE2 proteins, the binding efficiency wasdetermined by normalizing to anti-his-tag binding first, and then to the ... between CSFV vaccine C-strain and subgroup 2. 1 strains, but also among strains of the same subgroup 2. 1 as determined by ELISA-based bindingassay using pig antisera to the C-strain and a representative...