Epidermal thickness of back skin was quantified in H&E stained sections of indicated mice treated with rIL-23 (i.d., 1µg) and/or IMQ for two consecutive days. (n = 4-7; 3 independent experiments). Data information: Data are shown as mean ± SEM. P‐values were calculated by one-way ANOVA with Tukey multiple comparison test Statistical significance: ns > 0.05, *P < 0.05, **P < 0.01, ***P < 0.001, **** P < 0.0001. See Appendix Table S3 for exact P‐values. 