Exocytosis of platelet dense granule content ADP is the most important constituent of dense granules, essential for recruiting platelets to the site of vascular injury. Other components include ATP, Ca++, GDP, GTP, Mg++, orthophospate, pyrophosphate, and serotonin. Authored: de Bono, B, Pace, N.P., Farndale, R, 2004-09-25 17:06:19 Pubmed1435334 Pubmed19073150 Pubmed4132863 Pubmed4426930 Pubmed4809565 Reactome Database ID Release 43481009 Reactome, http://www.reactome.org ReactomeREACT_21354 Platelet dense granule content Platelet dense granule content