Exposure of anionic phospholipids upon platelet activation permits binding of beta 2 glycoprotein I and through it that of IgG antiphospholipid antibodies. Studies in platelets from patients with antiphospholipid syndrome and normal subjects - Vazquez-Mellado, J; Llorente, L; Richaud-Patin, Y; Alarcon-Segovia, D (J Autoimmun, 1994)