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Figure 5: Immunohistochemical staining of efferent nerve endings by synaptophysin and α-synuclein. Much more intense and distinct staining of efferent nerve buttons with by synaptophysin and α synuclein were observed in control (G1), bilaterally plugged ears (G2) and plugged ear of G3 than those of unplugged ear of G3 and noise control (G4) (a). Signifi cant differences were observed in mean diameters (b) and numbers (c) of efferent buttons between bilaterally plugged ears and unilaterally plugged ears and between plugged and unplugged ears of unilaterally plugged group (G3). *P < 0.05 versus bilateral, P < 0.05 versus unilateral

Figure 5: Immunohistochemical staining of efferent nerve endings by synaptophysin and α-synuclein. Much more intense and distinct staining of efferent nerve buttons with by synaptophysin and α synuclein were observed in control (G1), bilaterally plugged ears (G2) and plugged ear of G3 than those of unplugged ear of G3 and noise control (G4) (a). Signifi cant differences were observed in mean diameters (b) and numbers (c) of efferent buttons between bilaterally plugged ears and unilaterally plugged ears and between plugged and unplugged ears of unilaterally plugged group (G3). *<i>P</i> < 0.05 versus bilateral, <sup>†</sup><i>P</i> < 0.05 versus unilateral