STAT3 and Psoriasiform dermatitis: Finally, P90 NbnKrox20-Cre epidermises exhibit increased phosphorylation/activation of Stat3 (p-Stat3), p38 (p-p38), p44 (p-p44) and S6 ribosomal protein (p-S6) which are also hallmarks of psoriasiform dermatitis (Figure 3C).