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Cover legend: Immunofluorescence triple labeling of doublecortin-stained neuroblasts (green), Ki67-stained proliferating cells (red), and DAPI-stained nuclei (purple) in the adult subependymal zone after Smad4 deletion. Proliferation of neuroblasts is not impaired in the absence of Smad4. For more information, see the article by Colak et al. in the January 9, 2008 issue (pages 434–445).