FIG. 3.

Comparison of LPS-rich and LPS-free peptide NC-1130 preparations for their abilities to induce peptide NC-1130-specific IgG antibody responses. Mice were exposed nasally with the indicated peptide doses and 1.0 μg of CT. Both LPS-free (white bars) and LPS-rich (black bars) peptide preparations were used. The control groups are mice immunized with CT alone. Indicated are the means plus 1 standard deviation of five mice per group. Statistically significant differences are indicated in the figure.