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Figure 4 Frozen atrial sections stained with anti-alpha-actinin sarcomeric (red), anti-MMP-2 (green) (A, B), and anti-MMP-7 (green) (E, F) from sham (A, C, E) and infarcted (B, D, F) rats in severe heart failure. Arrow in panel F indicates peripheral cell staining. Note that distinct magnifications were used in panel A, B (x20) and C to F (x40); Bar = 20 µm.