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Schematic illustration of NIR-II ratiometric fluorescence probes for real-time non-invasive detection of tumor-draining lymph nodes. (A) Schematic diagrams of NIR-II ratiometric fluorescence probes. (B, C) Detection principle of NIR-II ratiometric fluorescence probes with non-overlapping wavelength emission. (D) NIR-II ratiometric fluorescence probes for real-time non-invasive detection of tumor-draining lymph nodes. Images were created with BioRender.com.
