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Thin section electron microscope pictures demonstrating the gradual deterioration of nuclear and nuclear envelope structures with age. Muscle nuclei from anterior (B, F, and H), middle (A, D, and I), and posterior (C, E, and G) of the worm. The nuclei were from days 4 (A–C),8(D–F), and 12 (G–I) animals grown at 25°C. (Scale bars, 2 μm.)
