Cover picture: Astrocytes are evenly distributed across gray matter in non-overlapping territories. This orderly pattern of organization parcels the neuropil into small astrocyte-delimited domains that outline the vasculature by their GFAP-expressing processes. A GFAP-stained vibratome section (150micro-m) is shown. For details, see the article by Simard et al. in this issue (pages 9254–9262).