New insights into stem cell function 

By developing and characterizing new fluorescent probes enabling fast, reversible, and ratiometric reaction with glutathione, Jeong et al. reveal considerable dynamics and heterogeneity in glutathione levels in living stem cells in response to environmental stress and also show that high glutathione levels are required for maintaining stemness of murine embryonic stem cells or therapeutic potency of mesenchymal stem cells.
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FreSHtracer is now commercially available (Cell2in, Seoul, Korea; www.cell2in.com).
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