Sm-p80 specific antibody titers of IgG subclasses in both homologous (Ho) and heterologous (He) experiments. Shown in panels (A) IgG1; (B) IgG2a; (C) IgG2b and (D), IgG3. The given titer values represent the mean of triplicate tests, standard error of the mean (SEM). Significance (*p) is considered at P < 0.01; 95 % confidence interval. IT12, IT08, IT09, IT94, IN07, IG29, IP15, IP17, IG97 are the identifiers of baboons from which the IgG was purified. Details of vaccination experiment has been given previously[18].