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Immunohistochemistry of the (a) right PCA, (b) right TA, (c) left PCA and (d) left TA, stained for brain-derived neurotrophic factor for the (A) control group, and at (B) 3, (C) 6, (D) 10 and (E) 16 weeks. Magnification, ×100. PCA, posterior cricoarytenoid; TA, thyroarytenoid.
