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c-fos expression in the trigeminal nucleus caudalis. (A and B) In the control group, few c-fos positive cells were detected in the TNC. In contrast, 24 h after CFA injection, an increased quantity of c-fos positive cells was observed in the TNC. EXP: experiment (*p < 0.05, **p < 0.01, ***p < 0.001).
