Figure 2  .

(A) Using image analysis and colour segmentation a computer image can be produced in which the dense older collagen is magenta in colour and the more loosely arranged collagen green (L, lumen; C, core). The area of healing in the cap (arrow) is clearly delineated. (B) Immunohistochemistry for smooth muscle actin (red). The media stains completely due to its smooth muscle content. In the area of healing of the plaque cap (arrow) there is an increased concentrate of smooth muscle cells.