Divalent cation regulation of the surface-orientation of platelet membrane glycoprotein IIb : correlation with fibrinogen-binding function and definition of a novel variant of Glanzmann’s thrombasthenia - Ginsberg, MH; Lightsey, A; Kunicki, TJ; Kaufmann, A; Marguerie, G; Plow, EF (J Clin Invest, 1986)