Contents. List of Contributors. Preface (E.G. Lapetina). Platelet Morphology, Aggregation, and Secretion (A. McNicol and J.M. Gerrard). Platelet Adhesion Receptors (K.J. Clemetson). The Platelet Integrin, Gp IIb-IIa (C. Abrams and S.J. Shattil). The Integrin: Structure, Function, and Regulation of a Platelet Surface Collagen Receptor (S.A. Santoro, E.U.M. Saelman, and M.M. Zutter). The Platelet Thrombin Receptor (S.R. Coughlin). Platelet Arachidonic Acid Metabolism and Eicosanoid Receptors (C.J. Allan and P.V. Halushka). G Proteins and the Early Events of Platelet Activation (L.f. Brass, M. Poncz, and D.R. Manning). The Role of Low Molecular Weight GTP-Binding Proteins in Human Platelets (M. Torti and E.G. Lapetina). The Role of Signal-Transducing Phospholipases A,C, and D in Platelet Activation (S. Nakashima, Y. Banno, and Y. Nozawa). Ca2+ and Protein Kinase C in Platelets (J.D. Chang and J.A. Ware). Signal Transduction by Cyclic Nucleotide-Dependent Protein Kinases in Platelets (E. Butt and U. Walter). Protein Tyrosine Phosphorylation in Platelets (J.S. Brugge, E.A. Clark, and S.J. Shattil). Na+/H+ Exchange in Platelets (R. Nieuwland and J.N. Akkerman). Regulation of Platelet Function by Nitric Oxide (M.W. Radomski ands. Moncada). Index.