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NMJs of TA and PCA muscles become less complex with age. Representative electron micrographs of 6-, 18-, and 30-month TA (top) and PCA muscles (bottom). Arrows show decreased sprouting (or axonal terminal withdrawal) with age (scale bar = 0.4 μm). NMJ = neuromuscular junction; PCA = posterior cricoarytenoid; TA = thyroarytenoid.
