In vivo, T-cells develop in the thymus from bone-marrow derived hematopoietic stem and progenitor cells (HSPCs). In vitro, various model systems have been employed to mimic thymic function supportive of T-cell development including the OP9-DL1 system. Recently, a serum-free artificial thymic organoid (ATO) system was developed that supports highly efficient and reproducible in vitro differentiation and positive selection of human T-cells from multiple sources of HSPCs, including cord blood, bone marrow and peripheral blood CD34+ HSPCs (Seet et al. 2017). A key component of the ATO system is the MS5-mDLL1 cell line which obviates the need for primary thymic tissues.，官网链接：https://www.sigmaaldrich.cn/product/mm/scc166 默克 科研、开发、生产。 作为生命科学行业的全球领先供应商，我们致力于为科研、生物技术开发和生产，以及制药药物疗法开发和生产提供各类解决方案和服务。

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