Figure 5From: Optogenetic activation of brainstem serotonergic neurons induces persistent pain sensitization Cannula implantation does not alter basal pain thresholds. (A and B) Basal mechanical (A) and thermal (B) thresholds before (baseline) and 7 d after surgery for implantation of the optic fiber cannula in WT mice (n =5) and in TPH2-ChR2 mice (n =5) (paired and unpaired t test).Back to article page