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Figure 5 Immunostaining for Ki-67 shows one positive nucleus (brown color, arrow) in the myxoid tissue of human coronary stent neointima at 2.5 months after stenting (A). In tissue of stent neointima at 23 months after stenting, several Ki-67-positive nuclei were noted (B). Tissue of human tonsil as a positive control shows many positive Ki-67-stained nuclei of lymphocytes in the follicular structure (C). Counterstaining with either hematocylin (A, B) or methylgreen (C). Bar = 100 µm.