Confocal live cell microphotographs of LX2 cells stained with the fluorescent dye for endosomal (empty arrowhead) and lysosomal (full arrowhead) compartments pHrodo red and (A) NRB-AF12 or (B) ER-Tr green. Magnification 60x; scale bar 10 μm. (C,D) Co-localization of NRB-AF12 and ER-Tr Green with endosome and lysosome vesicles is shown as Pearson's coefficient (*p < 0.05; n ≥ 10).