PARP2 and dermatitis: We performed the IMQ-induced dermatitis as follows: PARP2+/+ and PARP2−/− mice that were treated with vehicle and IMQ (WP and PP mice, respectively), and PARP2+/+ and PARP2−/− mice that were treated with topical exemestane solution prior to treatment with IMQ (WPE and PPE mice, respectively).