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Radial histological sections of the mitral valve in various age groups with Elastic Van Gieson staining. (A) A 20–29 years, (B) 40–49 years, (C) 50–59 years, (D) 60–69 years, (E) 80–89 years. A, atrialis; F, fibrosa; S, spongiosa; V, ventricularis. Scale Bars=50 μm (A–E).
