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The number of HVC-RA neurons retrogradely labeled at 95 d of age does not change during the following 9 months. Counts of HVC-RA neurons retrogradely labeled with latex microspheres injected into RA at 95 d of age are similar after 1, 3, 6, and 9 months survival time. Each data point represents the mean between left and right HVC within one bird. Group means are represented as black bars. Error bars represent SEM.
