Rabies virus trans-neuronal tracing was performed on three-month-old hiPSC neurons cocultured with wildtype human astrocytes (Sciencell) on acid-etched glass coverslips and then transduced with LV-SYNP-HTG or LV-SYNP-HT. Cultures were transduced with Rabies-ENVAΔG-RFP after at least a week to allow expression of ENVA and rabies G. Either 5, 7 or 10 days later, hiPSC neurons were either dissociated with accutase for FACS analysis of fixed with 4% paraformaldehyde in PBS for fluorescent microscopy.