At present, Nuwacell Biotechnologies Co., Ltd. has been able to prepare large quantities of stable disease-specific and healthy control human induced pluripotent stem cells (iPSC). Therefore, we can provide researchers with unlimited and high quality iPSC to simulate clinical phase I trials. Testing the toxicity of drugs in vitro partially replaces the current phase I clinical trials directly on humans, so as to avoid the drug toxicity to patients in the phase I clinical trial, thus can improve the protection of the rights and interests of subjects.