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Formation of mature myofibrils along the side near the end of a myotube. Myotube expressing GFP-α-actinin is shown at the same microscope stage coordinates at (a) 0, (b) 1 hour, (c) 2 hours, and (d) 4 hours of observation. During this time the Z-bodies of premyofibrils at the edge of the myotube (a, arrows) aligned and fused to form the Z-bands of mature myofibrils (a to d). Bar = 10 microns.
