Cover legend: An isolated sciatic nerve fiber, partially projected to show each half and the middle of the fiber. The fiber is stained with fluorescent phalloidin (green), dystrophin-related protein 2 antibodies (red), and nuclear DAPI (dark blue) to show compartments present outside myelin, which is stained with antibodies against myelin basic protein (light blue). For more information, see the article by Court et al. in this issue (pages 12208–12217).