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Cross-sections of adult Ctrl (A,B) or SM-Dicer KO aorta (C,D). The rectangles in panels A and C represent magnified regions shown in panels B and D. Scale bars are indicated at bottom left of each panel. Arrows in panel D point to regions of SMC cytosol devoid of myofilaments. See Figure S4 for additional images of the Dicer KO ultrastructural phenotypes. lu, lumen; nu, nucleus.
