Taming platelets with cyclic nucleotides11Abbreviations: ABP, actin binding protein; AC, adenylyl cyclase; cAMP, cyclic AMP; cAMP-PK, cAMP-dependent protein kinase; cGMP, cyclic GMP; cGMP-PK, cGMP-dependent protein kinase; DAG, 1,2-diacylglycerol; EDRF, endothelium-derived relaxing factor; GC, guanylyl cyclase; GP, glycoprotein; Hsp27, heat shock protein 27; IP3, inositol 1,4,5- trisphosphate; IRAG, IP3 receptor-associated cGMP-PK substrate; MAPK, mitogen-activated protein kinase; MAPKAPK-2, MAPK-activated protein kinase-2; MARCKS, myristoylated alanine-rich C kinase substrate; MLC, myosin light chain; MLCK, myosin light chain kinase; PDE, phosphodiesterase; PG-E1, prostaglandin E1; PG-I2, prostacyclin; PIP2, phosphatidylinositol 4,5-bisphosphate; PKC, protein kinase C; PLC, phospholipase C; TxA2, thromboxane A2, and VASP, vasodilator-stimulated phosphoprotein.