A microscopy technique based on stimulated Raman scattering achieves label-free imaging with very high sensitivity.
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Gratton, E., Digman, M. One photon up, one photon down. Nat Biotechnol 27, 147–148 (2009). https://doi.org/10.1038/nbt0209-147
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DOI: https://doi.org/10.1038/nbt0209-147
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