Rhodocytin (aggretin) activates platelets lacking α2β1 integrin, and the ligand binding domain of GP1bα - Bergmeier, W; Bouvard, D; Eble, JA; Mokhtari-Nejad, R; Schulte, V; Zimgibl, H; Fässler, R; Nieswandt, B (J Biol Chem, 2001)