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, M H; Lightsey, A; Kunicki, T J; Kaufman, A; Marguerie, G A; Plow, E F (J Clin Invest, 1986)