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Figure 6 Photomicrographs of microvessels identified by double-label immunochemistry stain using CD34 and CD68/CD3 (left) and CD34 and smooth-muscle actin (right). (A) Microvessels are labeled with blue chromogen and macrophages/T lymphocytes are labeled with a red chromogen at the base of the plaque. (B) Tunica media microvessels are labeled with a purple chromogen and the smooth-muscle cells with a brown chromogen. Reprinted with permission from Moreno PR, et al. Circulation 2004;110:2032–8.