Cover picture: Fluorescence image of WAVE1 localization in a lamellum of an oligodendrocyte precursor cell purified from forebrain of 2-d-old rats. WAVE1 (red) staining shows a dot-like continuous localization along the leading edge of a lamellum (stained green for actin) of an oligodendrocyte precursor cell. For details, see the article by Kim et al. in this issue (pages 5849–5859).