Subcellular localization of 5b in HEp2 cells at 10 μM for 6 h: (a) phase contrast, (b) overlay of 5b and phase contrast, (c) ER Tracker Blue/White, (d) overlay of 5b and ER Tracker, (e) BODIPY ceramide, (f) overlay of 5b and BODIPY ceramide, (g) MitoTracker Green, (h) overlay of 5b and MitoTracker, (i) LysoSensor Green, (j) overlay of 5b and LysoSensor. Scale bar: 10 μm.