We do not offer DMEM/F12 medium without folic acid as a standard catalog product. However, our Customs group can make it for you as a custom media. If you are interested, please complete this Custom order inquiry form PDF (https://www.thermofisher.com/content/dam/LifeTech/global/applied-sciences/pdfs/Bioproduction/Gibco-Custom-Media-Buffers-Request-Form.pdf) and email it to custommedia@thermofisher.com. Our Customs group will review your requirements and get back to you within a couple of days with pricing, ordering information, and lead time. After that, you have the choice of proceeding with an “official” order or declining.
How do I characterize human embryonic stem ( ES) cells?
Human ES cells are generally characterized by their typical morphology (they grow as tightly packed clusters of small cells with high ratio of nucleus to cytoplasm); surface marker expression; RT-PCR detection of stem cell-specific gene expression (such as Oct3/4, Sox2, and Nanog); alkaline phosphatase staining, and telomerase activity assay. The most commonly used ES specific surface markers include stage-specific embryonic antigens SSEA-3 and SSEA-4 for human ES cells. Other ES-specific surface antigens also include TRA-1-60 and TRA-1-81. (Science 282:1145 (1998).
How are human embryonic stem (ES) cells derived?
Human ES cells are derived from human blastocyst inner cell masses, isolated by immunosurgery with rabbit antiserum to BeWO cells (a human trophoblast cell line) (Science 282:1145 (1998)).