Cover legend: Section of nasal area of NogLacZ mouse embryo at E11.5. Neurons of the olfactory pit immunostained against HuC/D are blue and Noggin is orange. Noggin is not expressed in the neurogenic areas of the olfactory pit but limited to the respiratory epithelium and the nasal mesenchyme. For more information, see the article by Forni et al. (pages 19620–19634).