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Enhancement of OVA-specific antibody responses by Alcaligenes lipid A. Mice were subcutaneously immunized with OVA plus Alcaligenes lipid A (1 μg) or OVA alone (1 or 10 μg) on days 1 and 10. One week after the last immunization, serum was collected to measure with ELISA to determine the levels of OVA-specific IgG (a), IgG1, IgG2b, and IgG3 (b) (n = 7 per group). Data are a combination of two independent experiments.
