COL17A1 and autoimmune bullous skin disease: The protein or combination of proteins recognized by the autoantibodies vary for each specific pemphigoid disease: collagen XVII [BP180, bullous pemphigoid antigen 2 (BPAG2)] and/or BPAG1e (BP230, dystonin) for BP, PG, and LPP, collagen VII for EBA, collagen XVII, BPAG1e, laminin-332 (laminin-5), laminin-311 (laminin-6), collagen VII, or β4 integrin for MMPh, truncated collagen XVII fragments [linear IgA disease antigen-1 (LAD-1), linear IgA bullous disease antigen of 97 kDa (LABD97)], and/or BPAG1e for LABD, and laminin γ1 for anti-laminin γ1 pemphigoid (56–74).