Cover legend: Confocal projections showing ventral zebrafish olfactory bulbs at 11, 21, and 35 days after fertilization. The magnification and image settings are consistent among the three specimens shown. Olfactory glomeruli (red) were visualized with an antibody directed against synaptic vesicle protein 2 and axonal inputs from the olfactory epithelium (white) were visualized with an antibody against keyhole limpet hemocyanin. Some regions of the olfactory bulb remain virtually unchanged during this period of dramatic growth and reorganization, while alterations in other regions are influenced by olfactory experience. For more information, see the article by Braubach et al. (6905–6916).