Confocal images of AAV9-hSyn and AAV9AU-hSyn mediated transduction in the rat striatum. (A–C) AAV9-JetI-GFP gene expression primarily co-localizes with the oligodendrocyte marker, Olig2, while (D–F) the general lack of GFP co-localization is with the neuronal marker, NeuN. In contrast (G–I), AAV9AU-JetI-GFP gene expression exhibits substantial co-localization with NeuN, but little co-localization with Olig2. Scale bars equal 20 μm. AAV, adeno-associated virus; GFP, green fluorescent protein.