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Figure 2 (A) Low-power slices of left ventricles stained with picrosirius red staining. Muscle cells stain yellow, whereas collagen stains red. The section shows that implanted collagen thickens the wall (blue arrows) of the six-week-old myocardial infarct scar area with bright red collagen. (B) Saline-treated heart with six-week-old myocardial infarct (black arrows). Note the staining of the infarct scar collagen in the thin free wall of the left ventricle is much less intense than that of the implanted collagen (bright red staining).
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