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Circumferential cross-sections stained in Verhoeff–Van Gieson of (a) anterior basal (AB), anterior marginal (AM), anterior strut (AS), and (b) posterior basal (PB) and posterior marginal (PM) for two human hearts. Abnormal structure with excessive layer of fibrous tissues surrounding the core was found in AM of heart #1 and AB, AM of heart #2. Bar=1000 μm.
