Cover legend: Whisker-related patterning glutamate transporter GLT1 in the mouse somatosensory cortex at postnatal day 7. Sensory maps in the cortex are modified in an activity-dependent manner, especially when inputs from the periphery are altered during early postnatal life. As soon as barrels are structured in the neonatal period, GLT1 on astrocytes also establish barrel-like expression. This transporter was found to promote shrinkage of barrels corresponding to lesioned whiskers and the expansion of adjacent intact barrels. For more information, see the article by Takasaki et al. in the May 7, 2008 issue (pages 4995–5006).