IL12B and psoriasis: An overview of the numbers of potential AREs in cytokine mRNAs involved in the pathogenesis of psoriasis is given in Figure 1; numbers range from a total of 12 AUUUA-pentamers in the 3'UTR of the shared p40 subunit (IL-12B) of IL-12 and IL-23 to one element in IL-19 and TGF-β.