MALT1 and dermatitis: Next to full body Malt1-KO mice, also T cell-specific (Malt1FL/FLCD4-CreTg/+) and keratinocyte-specific (Malt1FL/FLK5-CreTg/+) Malt1-KO mice were monitored for skin lesions over time, but these mice did not develop any skin lesions (Figure 1B), indicating that absence of MALT1 in T cells or keratinocytes, as such, is not sufficient to induce skin inflammation.