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TLR4 expression in TG neurons innervating tongue on day 3 after CFA injection into tooth pulp. (A) TLR4-IR cells and FG-labeled cells in the TG in sham, saline-applied, or CFA-applied rats, respectively, and merged indicates TLR4-IR cells were merged with FG-labeled cells. FG was injected into the tongue. (B) Low magnification photomicrographs of the TG. (C) The mean number of TLR4-IR cells labeled with FG in sham, saline-applied, or CFA-applied rats. *: P <0.05.
