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Thanized and their brains removed and either frozen using Optimal Cutting Temperature (OCT) compound (Electron Microscopy Sciences, Fort Washington, PA) in cryomolds placed atop dry ice, or fixed in 10 buffered formalin and paraffin embedded for histopathological analysis. The symptom-free survival of nude mice harboring U87MG parental versus transfected xenografts was compared. Kaplan-Meyer surv