Cover legend: Coronal section of the olfactory bulb of an adult wild-type mouse that received a homotopic graft of subventricular zone cells from a GFP ⁺/TrkB^−/− mouse and was killed 15 d later. Graft-derived neurons (green) migrate to the olfactory bulb, disperse radially into several olfactory bulb layers (granular layer shown in picture; red, DAPI nuclear dye), and extend dendrites even in the absence of the neurotrophin receptor TrkB. For more information, see the article by Galvão et al. in this issue (pages 13368–13383)).