Cover legend: Montage depicting maturation of newborn granule cells in the adult dentate gyrus 21 days after lesion of the perforant path. The denervated dentate gyrus (lower left) completely lacked excitatory axons in the outer two-thirds of the molecular layer (vGlut1 immunoreactivity, red), unlike the contralateral control (middle left). Two newborn granule cells (green), labeled with a GFP-tagged retrovirus on the day of the lesion, are enlarged and superimposed on the image, along with an enlarged view of one dendrite (middle right). Surprisingly, newly formed dendritic spines in the denervated zone were associated with already degenerated axon terminals (pseudo-colored red circles, upper right, overlay from electron micrographs). For more information, see the article by Perederiy et al. in this issue (pages 4754–4767).