Fig. 6

Distribution of IgG subtypes IgG1 and IgG2a in immunized mice. The levels of IgG subtypes IgG1 and IgG2a in sera of mice 2 weeks after the last immunization were analyzed by ELISA. Results are expressed as means of the OD 490 ± SD and statistically significant differences (P < 0.05) are indicated by an asterisk (*)