Cell type transduction in spinal cord tissue of NHPs by intrathecal delivery of AAV9-GFP and AAVF-GFP. Tissue sections were costained for GFP with different cellular markers: NF for neuron, GFAP for astrocyte, IBA1 for microglia, olig2 for oligodendrocytes. Scale bar = 20 μm. White arrows indicate costaining. GFAP, glial fibrillary acidic protein; NF, neurofilament; NHPs, nonhuman primates.