Primary Mouse Embryo Fibroblasts (MEFs) are used to support the growth of embryonic stem cells (ESCs) and induced pluripotent stem cells (iPSCs) and have been qualified for this use. They have been tested for viability, sterility and mycoplasma and have been shown to support the undifferentiated growth and proliferation of a range of human embryonic stem cell lines. The cells are suitable for in vitro research use only and are not for diagnostic, therapeutic or clinical application nor approv