Platelet alpha granule contents Platelet alpha granule contents Exocytosis of platelet alpha granule contents Alpha granules contain mainly polypeptides such as fibrinogen, von Willebrand factor, growth factors and protease inhibitors that supplement thrombin generation at the site of injury. In addtion to their role in hemostasis, platelets also contain angiogenesis stimulators and inhibitors (Italiano et al. 2008). Authored: de Bono, B, Pace, N.P., Farndale, R, 2004-09-25 17:06:19 Pubmed14630798 Pubmed15790929 Pubmed1737102 Pubmed17962514 Pubmed2110384 Pubmed2531289 Pubmed2752154 Pubmed287022 Pubmed3457014 Pubmed3965505 Pubmed444675 Pubmed47244 Pubmed501196 Pubmed5084810 Pubmed5789664 Pubmed59727 Pubmed6338048 Pubmed6414553 Pubmed6457647 Pubmed6459901 Pubmed6603475 Pubmed6946465 Pubmed7306699 Pubmed8467233 Pubmed8514871 Pubmed9684805 Reactome Database ID Release 43481007 Reactome, http://www.reactome.org ReactomeREACT_21351