Genetic loss of TRESK does not alter the excitability of small lumbar DRG neurons. A, B, The percentage of lamotrigine-sensitive persistent K+ currents (A) and the total persistent outward current density (B) in small-diameter DRG neurons from adult WT and TRESK KO mice (n = 14–20 neurons in each group). ***p < 0.001; one-way ANOVA with post hoc Bonferroni test, compared with the WT group. NS, No statistically significant difference. C, D, Mean rheobase (C) and Rin (D) of small IB4− and IB4+ DRG neurons from WT and TRESK KO mice (n = 16–19 neurons in each group; for details of the intrinsic properties of DRG neurons, see Table 3). E, F, Input/output plots of the spike frequency in response to incremental depolarizing current injections in small IB4− (E) and small IB4+ (F) DRG neurons from WT and KO mice (same neurons as in C).