GAPDH and type 2 diabetes mellitus: Compared with CTLs (0.0195 ± 0.0106, n = 20), the relative mRNA expressions of AHR (compared to GAPDH, same below) was significantly increased, by 2.02- and 3.06-fold respectively, in MHO (0.0394 ± 0.0202, n = 30) (*P = 0.0145) and T2D (0.0596 ± 0.0322, n = 30) (***P < 0.0001) patients.