Fig. 4. Confocal fluorescence images of HeLa cells incubated with 10 μL nanoprobe (a) before and (b) after NIR irradiation for 20 min, and treated with (c) casp-9 and (d) casp-3 inhibitor for 6 h and then NIR irradiation for 20 min. Green fluorescence at λ ex/em of 488/500–560 nm. Red fluorescence at λ ex/em of 633/680–740 nm. Scale bars, 25 μm.
