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In article number 1905572, Fan Wang and co‐workers develop near‐infrared Bessel‐beam emission saturation nanoscopy to simultaneously tackle the problems in light absorption and scattering for biological tissues, enabling the tracking of single nanoparticles inside a multicellular tumor spheroid in the depth over 55 µm with an imaging resolution of sub‐98 nm.
Cancer spheroids have structural, functional, and physiological similarities to the tumor, and have become a low‐cost in vitro model to study the physiological responses of single cells and therapeutic efficacy of drugs. However, the tiny spheroid, made of a cluster of high‐density cells, is highly scattering and absorptive, which prevents light microscopy techniques to reach the depth inside spheroids...
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