Cover legend: Corpus callosum axons in coronal brain slices labeled with antibodies against neurofilaments (magenta) and glial nuclei (yellow) labeled with Sytox. Note the dimly fluorescent cell bodies with clear cytoplasm containing three to five nuclear inclusions (dark yellow) characteristic of uninjured glial nuclei. For more information, see the article by Baltan et al. in this issue (pages 3990–3999).