Adapter protein that interacts with EDAR DEATH domain and couples the receptor to EDA signaling pathway during morphogenesis of ectodermal organs. Mediates the activation of NF-kappa-B (By similarity). Binds EDAR. Self-associates and binds TRAF1, TRAF2 and TRAF3 (By similarity). Detected in embryonic skin (12.5 dpc and 14.5 dpc) during the formation of hair follicles and at 15.5 dpc in the enamel knot of the developing tooth. Detected in the basal layer of the epidermis and hair follicles of P2 mice.