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Figure 6 Representative scanning electron micrographs of vein graft aspirate. (A) Shows tissue resembling a fibrous cap; the sample possibly rolled during removal or processing (scale = 20 µm). (B) Fragment of plaque material containing numerous cholesterol-laden macrophages; the rod-shaped fragment in the upper left is a cholesterol crystal (arrow, scale = 50 µm). (C) Particle showing a cluster of macrophages (scale = 10 µm). (D) Macrophages interspersed in a fragment of atherosclerotic plaque (scale = 20 µm).