Cover picture: Atomic force microscopy scan showing a height mode (a), and deflection mode (b) image of a fluid-phase domain emerging within a ripple-phase ordered region in a 7:3 DMPC/DSPC lipid bilayer. The image was taken at 29.5 °C, which is within the fluid-phase/ordered-phase coexistence temperature regime. The fluid-phase domain shows preferential growth along the ripples. As a result, the overall geometry of the emerging fluid-phase domain structure is determined by the presence of ripples. Scale bar, 100 nm. See the article by Leidy et al. on p. 2625.