Follicle cell TOR activity influences germline growth. (A-D) Wild-type germline cysts completely surrounded by control, TorP2293L, TorW1251R and Tsc1Q87X GFP-negative follicle cells (arrowheads). Arrows, neighboring control follicles; GFP (green), heterozygous cells; 1B1 (red), follicle cell membranes. Scale bar: 50 μm.