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The specific IgG antibody levels of mice immunized with recombinant TsAP protein assayed by ELISA using different antigens. The optical density (OD) values shown for each group are the mean ± standard deviation (SD) of antibody levels (n = 13). Asterisks (*) indicate statistically significant differences (P < 0.01) in OD values of one kind of antigens compared to other two kinds of antigens.
