Immunohistochemical staining of glycoprotein IIb/IIIa receptor, sections were incubated with the mouse anti-human integrin alpha-2b/beta-3 monoclonal antibody and counterstained with hematoxylin. The image on the left is the representative image of thrombus caused by Thrombosomes in PFP. It shows an intense dark stain suggestive of glycoprotein IIb/IIIa receptor expression. The image on the right is PFP and only shows background staining, confirming absence of glycoprotein IIb/IIIa receptor expression.