Cover picture: Transparent, surface-shaded map of recombinant Kv2.1 with a fit of the α-chain of Kv1.2 (Protein Data Bank ID 2a79). The isosurface of Kv2.1 has been set to enclose 100% of the expected volume. The four polypeptide chains of Kv1.2 are each shown in a different color. The views displayed start at the upper left and proceed clockwise: 1), view of the map with the fourfold symmetry axis oriented perpendicularly; 2), the same view, but rotated by 45° around the fourfold axis; 3), the same view as the first, but with the fourfold symmetry axis pointing toward the viewer; and 4), the same view as the first, but only a single Kv1.2 subunit is displayed. See the article by Adair et al. on page 2106.