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Figure 1 Endomyocardial tissue from one hypertensive patient with heart failure. Sections were stained with picrosirius red and collagen fibers were identified in red (x40). Collagen tissue was seen as thin bands surrounding individual cardiomyocytes or groups of cardiomyocytes (mysial collagen, left panel), as large strands localized around intramyocardial vessels (perivascular collagen, middle panel), and as masses or scars diffusely localized within the interstitium (scar collagen, right panel).