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Estimated cell densities from the three subdivisions of the SOC. Age-related comparisons of NADPHd (A)-positive and parvalbumin (PV; A)-positive cell densities in the medial nucleus of the trapezoid body (MNTB), medial superior olive (MSO), and lateral superior olive (LSO). Solid bars represent middle-aged density averages, and open bars represent density averages from aged animals. Significant increases of both NADPHd and PV were noted only within the MSO nucleus. *P < 0.01.
