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Figure 3 Cell proliferation and TN-C expression in the patent vein graft. The pattern of cell proliferation was compared with the expression of TN-C. (A) PCNA labeling of vein graft (brown reaction product indicated with arrowhead) shows numerous PCNA-positive cells in the adventitia (a) and neointima (n). (B) TN-C expression (red) was concentrated in the adventitia (a) and media (m) but not found in the neointima (n). Magnification: 30x, reduced by 65%.