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Antibody responses to r-SAG1. BALB/C mice were immunized with 30 µg r-SAG1 of T gondii or with PBS as a control. Booster was done with Freund’s incomplete adjuvant 2 wk after the first injection. Three weeks post-immunization, sera were collected from 5 mice of each group. Antibodies were tested individually by ELISA.
