Immunohistochemical colocalization of TF apoprotein and plasminogen in human atherosclerotic coronary artery. TF apoprotein stained blue; plasminogen stained brown (see the Materials and Methods). A large coronary artery is shown at an original magnification ×200. (A) Endothelial cells overlying plaque. (B) Acellular plaque with cholesterol cleft. (C) Acellular plaque matrix. (C) Adventitia. (E) Media of small artery within coronary artery. (F) Negative Ig control.