Experiment Testing virus region 8 (VR8) mutant cross-species compatible Adeno Associated Viruses (ccAAVs) in mice. Experiment Condition AAVcc84 Assay Description: Relative neuronal transduction levels were quantified by counting the number of transduced neurons, identified based on morphology, for each brain region per 50um sagittal section Tissue Measured: striatum Cell Type : neuron Measurement Type: Delivery Efficiency Record ID 15000000387 Editor Delivery System Delivery System Subtype Guide Vector AAVcc84-GFP; Model Species Mouse Model Name C57BL/6 Sample Age 8 weeks Sample Sex Male Application Method intravenous Application Site Dosage 5e13 vg/kg Injection Frequency once Injection Rate Injection Volume 200 microliters Days post injection 4 weeks Editor Format AAV vector encoded Antidote Id Antidote Description Measured Values Samples Size: 3   Replicate Result (Delivery Efficiency) Measurement Units: # of cells in 50um Section Mean 177.17  1 155.5  2 148  3 228

Representative image of AAVcc84 delivery in brain striatum. Neuronal and astrocytic expression were visualized by immunohistochemical staining.