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σ1s does not influence viral growth in the brain. Viral titers were not significantly different between σ1s− and all σ1s+ viral strains (P > 0.05). T3A and C84 viral titers were significantly different (**, P < 0.01). Each bar represents the average viral titer from three to six mice 8 days post-intracranial inoculation. Error bars indicate standard errors of the means.
