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Titers of IgG antibodies to synthetic HA2 peptides in sera of immunized mice after the third immunization. The results are expressed as the mean titer ± the standard deviation for each group. Significant differences (p < 0.05) from control groups are marked with an asterisk (*). The differences between titers of M2e-specific antibodies recognizing G-107 and G-108+G-109 were not statistically significant.
