Small, soluble, ubiquitous ligands are difficult to visualize. Schwab and colleagues have created a functional receptor reporter that gauges the in vivo concentration, location and biological action of sphingolipids.
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Brinkman, C., Bromberg, J. Biological sensors shed light on ligand geography. Nat Immunol 16, 1209–1211 (2015). https://doi.org/10.1038/ni.3315
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DOI: https://doi.org/10.1038/ni.3315
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