Cover picture: Side view of the highly unsaturated 1-stearoyl-2-docosahexaenoyl-sn-glycero-3-phosphocholine (SDPC) lipid bilayer in the fluid lamellar phase at 2 ns of a molecular dynamics simulation. The presence of the docosahexaenoyl chains (green), which have the tendency to visit the lipid-water interface, increases the disorder of the model membrane. Molecules are depicted by their atomic van der Waals radii, and, for the sake of clarity, the hydrogen atoms of the lipids are not displayed. The color code for the lipids is as follows: nitrogen (black), phosphorus (yellow), oxygen (red), and carbon (gray) atoms; the carbon atoms of the polyunsaturated chain are colored green. The oxygen and hydrogen atoms of the water molecules are shown as blue and white spheres, respectively, and the simulation cell is highlighted in red. See the article by Saiz and Klein on p. 204.