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Figure 7 Proliferating fibroblasts and presence of myofibroblasts in patients with decompensated hypertrophy (group III). (A) Cell-proliferation-associated antigen-Ki67 (green) is confined to fibroblasts labeled for vimentin (red); (B) quantification of Ki-67-positive fibroblasts. (C and D) Myofibroblasts (arrows) in the myocardial ECM expressing alpha-smooth muscle actin (green) and vimentin (red). (C) Myocytes are red with phalloidin. Nuclei are blue.