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Survivals and weights of immunized mice challenged with influenza virus. The mice immunized with M2e-FP-1 and M2e-FP-2 proteins, respectively, or PBS as a control were challenged with A/PR/8/34(H1N1) influenza virus (103 TCID50), observed for 14 days p.i., and calculated for percentages of weights (A) and survivals (B). The data in (A) are presented as mean ± SD of 6 mice in each group.
