Cover legend: 3D-SIM projection image of Drosophila third-instar larval neuromuscular junction. The microtubule-associated protein Futsch is labeled in magenta and the active zone protein Bruchpilot is labeled in green. The high-resolution microscopy used here enables visualization of the doughnut shape of Bruchpilot staining. For more information, see the article by Lepicard et al. (pages 6759–6771).