Neutrophils circulating in the blood of patients with acute myocardial infarction contain intracellular platelets. (A-F) Representative images by electron microscopy of neutrophils from 4 patients with acute myocardial infarction. Neutrophils were immediately purified from blood and processed as described in “Adhesion and phagocytosis.” (G-I) Representative confocal microscopy of neutrophils from 3 patients with acute myocardial infarction. Whole blood was processed and stained as described in “Adhesion and phagocytosis.” MPO, green; platelet glycoprotein Ib (CD42), pink. DAPI, blue, was used for counterstaining of nuclei (n = 15).