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A Gene expression levels of proinflammatory cytokines and TLR3 in the nasal tissue. B Gene expression levels of proinflammatory cytokines and TLR3 in the olfactory bulb. Statistical analysis was performed using the Mann–Whitney U test, with P < 0.05 (*) and P < 0.01 (**) representing statistical significance. The error bars shown represent the standard error of the mean (n = 5). Poly(I:C) polyinosinic–polycytidylic acid
