IL23A and oral lichen planus: To verify the IHC results, we also detected the mRNA expressions of both subunits of IL-23 (IL-23p19 and IL-12p40) and IL-17 in 14 reticular OLP lesional tissues and 10 NOM tissues and found that the mRNA expressions of all the three genes in OLP lesions were significantly increased compared to NOM tissues (Figures 2(c) and 2(d)).