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T infusion near HVC prevents regression of HVC neuronal attributes. Infusion of T near HVC prevents regression of A) HVC soma area three and seven days after transition to nonbreeding conditions, B) HVC neuron density three days after transition to nonbreeding conditions and C) HVC neuron number seven days after the transition from breeding to nonbreeding conditions. Asterisks indicate a significant difference between hemispheres (one-tailed paired t-test; * = p ≤ 0.05, ** = p ≤ 0.01)
