yMSP119-specific antibody responses in different strains of mice primed with the immunodominant peptide(s) specific for that mouse strain, yMSP119, or PBS and then given a booster dose of yMSP119 on day 0. Bars are the means ± 95% confidence intervals (error bars) for the five mice in each group. Peptides 16 (P16), 18 (P18), 19 (P19), 22 (P22), 23 (P23), and 24 (P24) were used to prime mice.