Figure 9From: Identification and characterization of Toxoplasma gondii aspartic protease 1 as a novel vaccine candidate against toxoplasmosisIgG antibody responses in pTgASP1-immunized mice. Sera were collected 1 d prior to each immunization and screened by ELISA. Results are shown as the means of the OD 490 ± SD and statistical differences (P < 0.05) are indicated by * as compared with PBS or pEGFP.Back to article page