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Confocal fluorescence imaging of HepG2 cells incubated with Py-SiRh-NTR (2 μM) under different oxygen concentration conditions. (a–d) The near-IR channel fluorescence image (λex = 633 nm). (e–h) The merged image of near-IR channel fluorescence image and bright filed imaging. (i) Average fluorescence intensity from images of (a–d).
