Fig. 4. (a) Fluorescence microscopy images of HeLa cells stained with different concentrations of DZ1 (1.0–10 μM) and in aqueous phosphate buffered saline (PBS) buffer. (b) The fluorescence development of DZ1 in fixed cells and living cells, respectively. (c) Confocal one-photon and two-photon fluorescence microscopy image of HepG2 cells incubated with DZ1. (d) TEM micrograph of untreated mitochondria stained solely with DZ1.
