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Protection against influenza virus challenge. Weight loss (a) and survival (b) were recorded for 2 weeks. The weight loss and mortality data are presented as the means ± the SEM of triplicate tests (n = 5 mice per group). (c) Lung samples from different influenza virus-infected groups were acquired, fixed, and embedded in paraffin. Sections were stained with H&E (magnification, ×200). Scale bar, 200 μm.
