The movement of vesicle and cytosolic markers is not enhanced upon stimulation. A, B, Syt-GFP fluorescence shows no significant recovery either in the absence or in the presence of stimulation (n = 5 nonstimulated, n = 6 stimulated central boutons; n = 5 nonstimulated, n = 8 stimulated terminal boutons). Central and terminal boutons show a similar recovery pattern. Dotted lines show Syn-GFP fluorescence (the same as in Fig. 7, shown for comparison). C, D, Cytosolic GFP shows a significant recovery either in the absence or in the presence of stimulation. In both cases, it exceeds the recovery of Syn-GFP fluorescence (dotted lines). Central and terminal boutons show a similar recovery pattern (central, n = 7 per condition; terminal, n = 8 per condition).