Subcellular localization of 1b in HEp2 cells at 10 μM for 6 h: (a) phase contrast, (b) overlay of 1b and phase contrast, (c) ER Tracker Blue/White, (d) overlay of 1b and ER Tracker, (e) BODIPY ceramide, (f) overlay of 1b and BODIPY ceramide, (g) MitoTracker Green, (h) overlay of 1b and MitoTracker, (i) LysoSensor Green, (j) overlay of 1b and LysoSensor. Scale bar: 10 μm.