LysoTracker Red stains lysosomes and can be used to monitor autophagy in Drosophila. Live fat body tissues from Drosophila were stained with LysoTracker Red (red) and Hoechst 33342 (blue) to stain the nucleus. Tissues were isolated from fed (left) or 3-h starved (right) animals. Scale bar: 25 µm. This figure was modified from data presented in ref. 280, Developmental Cell, 7, Scott RC, Schuldiner O, Neufeld TP, Role and regulation of starvation-induced autophagy in the Drosophila fat body, pp. 167–78, copyright 2004, with permission from Elsevier.