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Analysis of apoptosis using TUNEL assay. Significant apoptosis was observed in the FITC-Au@SiO2-SR-BI group in both MS751 and H8 cells, while almost no apoptosis was found in the groups without infrared irradiation or coupled antibodies. Photo magnification, 200×. **P<0.01 compared with FITC-Au@SiO2 + infrared irradiation of H8 cells.
