Collagen but not fibrinogen surfaces induce bleb formation, exposure of phosphatidylserine, and procoagulant activity of adherent platelets: Evidence for regulation by protein tyrosine kinase dependent Ca2+ responses - Heemskerk, JWM; Vuist, WMJ; Feijge, MAH; Reutelingsperger, CPM; Lind-hout, T (Blood, 1997)