Cover legend: Development of the sensory epithelium in the mouse cochlea. The developing sensory epithelium was labeled with an antibody against the prosensory marker Sox2 at embryonic day (E) 13.5 (green), E14.5 (blue), E16.5 (yellow), and E18.5 (magenta). For more information, see the article by Okano et al. in this issue (pages 18104–18118).