Cover picture: An electron micrograph depicting a deuterosome, a unique structure that appears in a subset of radial glial cells in the mouse brain soon after birth. It is one of the first signs of the differentiation of some radial glia into ependymal cells. These deuterosomes are composed of a core from which centriole-like immature basal bodies radiate. These basal bodies then move to the ventricular surface of the cells and serve as nucleation centers for cilia. For details, see the article by Spassky et al. in this issue (pages 10–18).