Abstract
This protocol describes a highly standardized pipeline for transcription factor-mediated forward programming of human pluripotent stem cells into highly enriched glutamatergic or GABAergic neurons followed by a cryopreservation step that enables the generation of large quality-controlled batches. This approach is particularly useful for reducing interexperimental variability in the context of collaborative studies across different locations and time points. For complete details on the use and execution of this protocol, please refer to Meijer et al. (2019) and Rhee et al. (2019).