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As shown by AstraZeneca in Nature reviews*, one third of the safety failures is linked to CNS toxicity during the clinical trials of drugs. Therefore, relevant in vitro human model is needed to detect early neurotoxicity of drug candidates. In this study, sensitivity of iPSC-derived neuronal cells to 32 compounds is compared to the sensitivity of SH-SY5Y cells. Two types of iPS-derived cells are tested: central nervous system cells (CNS.4U™ cells) and peripheral nervous system cells (PERI.4U™ cells) from Ncardia. Toxic effects are then measured by HCS cell imaging.