StemoniX microBrain^® 3D Assay Ready is a powerful human iPSC-derived cortical spheroid screening platform with a nominal 50/50 mixture of cortical neurons and astrocytes. Spheroids contain functional and measurable glutamatergic and GABAergic circuitry and display spontaneous and synchronous calcium oscillations that can be pharmacologically modulated. Plates are compatible with typical high-throughput screening platforms and are delivered pre-plated, ideal for use in disease modeling, drug discovery and development, and toxicology applications.