RT-PCR analyses also revealed mRNA upregulation of pro-inflammatory cytokines (IL-1β and IL-6) and some Th1 or Th2 cytokines (IFNγ, IL-4, and IL-10), but not that of IL-2, TGFβ, and IL-17, at the delayed phase of oxazolone-induced contact dermatitis, similar within the three genotypes (Figure 7A–I). This evidence concerns the gene IL4 and contact dermatitis.