Three-photon imaging enables deeper tissue penetration in vivo, however, a lack of imaging probes has restricted its use. Now, this problem has been overcome by engineering non-toxic manganese-doped quantum dots.
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Zagorovsky, K., Chan, W. Illuminating the deep. Nature Mater 12, 285–287 (2013). https://doi.org/10.1038/nmat3608
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DOI: https://doi.org/10.1038/nmat3608