Interrogating the aged striatum: Robust survival of grafted dopamine neurons in aging rats produces inferior behavioral recovery and evidence of impaired integration oleh Timothy J. Collier, Jennifer O'Malley, David J. Rademacher, Jennifer A. Stancati, Kellie A. Sisson, Caryl E. Sortwell, Katrina L. Paumier, Kibrom G. Gebremedhin, Kathy Steece-Collier