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Results of anti-PA antibodies in the blood serum of mice immunized with recombinant adenoviruses by ELISA. Ad-PA-Fc – recombinant adenovirus containing the PA fused to the Fc-fragment of IgG2a; Ad- cPA – recombinant adenovirus containing a non-secretable form of PA; Ad-sPA – recombinant adenovirus containing the secretable form of PA. Positive control – the PA protein fused to an incomplete Freund’s adjuvant. Negative control – phosphate buffered saline (PBS)
