Fig. 2. (A–H) Confocal images of the probe (10 μM) incubated with different cell lines for 4 h. For C and D, the cells were pretreated with free cRGD (100 μM). Red fluorescence (TPETP, E_x: 405 nm; E_m: >650 nm); blue fluorescence (Hoechst, E_x: 405 nm; E_m: 430–470 nm).