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Kinetics and strength of humoral response in BALB/c mice immunized with PBS, pcDNA3.1, pSAG1, pSAG1/SAG3, pSAG1/SAG3-CTXA2/B. Mice were immunized on days 0, 14 and 28 and the tail vein serum samples were collected on the day before immunization and 2, 4, 6 weeks after immunization.
