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Confocal images of nanosensitizer-treated MCF-7 cells for real-time detection of intracellular O2• - bursts under X-ray irradiation. MCF-7 cells were treated with (A) TiO2 (Gd)-HE or (B) TiO2 (Gd)-TPP-HE. Following X-ray irradiation, cell images were obtained at 2-h intervals for up to 12 h. Scale bars are 125 µm.
