Fig. 3. One- and two-photon microscopy (OPM, TPM) confocal fluorescence images of A549 cells after incubation with probe 1 (10 μM, 20 μM and 50 μM) for 30 min and excitation at 458 nm (OPM) or 810 nm (TPM). The emission was collected at 520 ± 30 nm. Overlay-OPM: overlay of the bright field and OPM columns. Overlay-TPM: overlay of the bright field and TPM columns.
