IFNG and toxoplasmosis: ELISpot assays revealed that peptide P6 (YPIAPSFAM), derived from a putative microneme protein of T. gondii, was the only peptide that significantly increased the number of IFN-γ-producing cells in the PBMC of individuals seropositive for toxoplasmosis (Fig. 7A), compared to the vehicle control (p = 0.05).