NP-specific Ab titers in the sera of immunized mice. Ten- to 12-week-old IL-7^−/− K14-TSLP Tg, IL-7^−/−, and C57Bl/6 mice were immunized and sera were analyzed as indicated. Each symbol represents the result from an individual mouse. Filled symbols represent titers prior to immunization; empty symbols represent titers after immunization. (A) Titers of NP-specific IgM prior and 10 days after intravenous NP-Ficoll immunization. (B) Titers of NP-specific IgG titers prior and 15 days after intraperitoneal NP-OVA immunization.