Briefly, 1 × 105 4T1 cells were seeded in 6-well plates for 24 h. The cells were then incubated with BPQDs and BBPQDs for 4 h and then irradiated with a NIR laser (808 nm, 1.0 W/cm2) for 5 min. The cells were collected, stained with the Annexin V-FITC/PI Apoptosis Detection Kit for 15 min, and analyzed with flow cytometry.

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