Antigenic properties of individual protein fragments within the EC2 and the EC3 chimeric antigens. The immunoreactivities of GST-MIC2, GST-MIC3, GST-SAG1, and GST-EC2 (A) or GST-GRA3, GST-GRA7, GST-M2AP, and GST-EC3 (B) with IgG antibodies from T. gondii-infected individuals were analyzed by use of whole serum or serum after depletion of antibodies against combinations of antigen fragments (MIC2/MIC3 depletion, MIC2/SAG1 depletion, etc.). w/o, without.