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Radial histological sections of the pulmonary valve in various age groups with Elastic Van Gieson staining. (A) A 30–39 years, (B) 50–59 years, (C) 60–69 years, (D) 70–79 years. F, fibrosa; S, spongiosa; V, ventricularis. Scale Bars=50 μm (A–D).
