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The basal (high-frequency) half of the papillae of budgerigars sacrificed after 8 days of injection with kanamycin (0-day survival), 14-day survival, and 28-day survival. There is an almost complete loss of hair cells after 8 days of kanamycin injections, recovery is well underway by 14 days following the termination of injections, and hair-cell number is back to normal by 28 days following injections but with clear disturbance in the orientation patterns of the hair-cell stereocilia.
