Quantitative levels of Th1 cytokine (IFN-γ) in (A) granulomas derived from Taenia crassiceps infected, wild type versus SP-Precursor knockout and NK1 receptor knockout mice. *P< 05, IFN-γ levels in infected, SP-Precursor knockout-derived granulomas versus wild type-derived granulomas, †P< .05, IFN-γ levels in infected, NK1 knockout-derived granulomas versus wild type-derived granulomas. (B) Early versus late granulomas derived from Taenia crassiceps infected, wild type versus SP-Precursor knockout and NK1 receptor knockout mice. *P< 05, IFN-γ levels in infected, early stage versus late stage NK1 knockout-derived granulomas.