Von Willebrand factor without the A2 domain is resistent to proteolysis. - Lankhof, H; Damas, C; Schiphorst, ME; IJseldijk, MJW; Bracke, M; Furlan, M; Tsai, HM; de Groot, PG; Sixma, JJ; Vink, T (Thromb Haemost, 1997)