Cover picture: Depiction of a magnetically aligned model membrane consisting of the phospholipids DMPC (blue) and DMPG (green), the phospholipid chelate DMPE-DTPA (red) complexed with Yb³⁺ (yellow), and an integral membrane peptide, gramicidin A' (orange). A fourth lipid, DHPC, which is believed to reside in curvature defect regions, is not shown in this figure. The actual sample consisted of a 40% (w/w) solution in which DMPC/DHPC = 6.0, DMPC/DMPG = 20, DMPC/gramicidin = 50, and DMPC/DMPE-DTPA:yB³⁺ = 60. The vector (upper left) indicates the orientation of the magnetic field, H₀, with respect to the bilayer. See the article by Prosser et al. on p. 2163.