Cover legend: In the hippocampus of 8-week-old wild-type mice, almost all astrocytes express the transcription factor Pax6. Anti-GFAP antibody (magenta) marks astrocytes; GFAP-positive astrocytes express Pax6 protein in their nuclei (green). The picture was taken by a confocal laser microscope. For more information, see the article by Sakurai et. al. in this issue (pages 4604–4612).