Cover legend: Neural stem cells isolated from the subventricular zone of an adult C57BL/6 mouse. These cells form neurospheres in culture, and upon plating onto a matrix, they differentiate. The image shows neurosphere cells expressing β-III tubulin (red) and glial fibrillary acidic protein (green). Their nuclei are stained with 4′,6-diamidino-2-phenylindole (DAPI). For more information, see the article by Gadadhar et al. in this issue (pages 2615–2623).