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NRTN in 3 aged monkeys treated with AAV2-NRTN administration to striatum. Note abundant NRTN-positive cells in substantia nigra in all 3 cases (bottom panels) following NRTN expression in striatum (top panels), even in case when volume of NRTN coverage was only 4%. Scale bar in top panels represents 2.0 mm, and 0.2 mm in lower panels.
