Cover image: Altered skin innervation in the hind paw of a Bbs1-/- and Bbs4-/- mutant mouse. The deleted genes code for proteins in the basal bodies of sensory neurons and are mutated in humans with Bardet-Biedl syndrome, who suffer from deficits in hearing, vision, and smell. See the article by Tan et al. on pages 17524–17529. Image courtesy of Nicholas Katsanis.