Subcellular fluorescence of Pc 5b in HT-29 cells at 10 µM for 6 h. (a) Phase contrast, (b) Overlay of 5b fluorescence and phase contrast, (c) ER Tracker Blue/White fluorescence, (e) MitoTracker green fluorescence, (g) BODIPY Ceramide, (i) LysoSensor green fluorescence, and (d, f, h, j) overlays of organelle tracers with 5b fluorescence. Scale bar: 10 µm.