Cover picture: A model of the perennial ryegrass antifreeze protein as a -roll with two parallel -sheet regions, in yellow, as putative ice-binding surfaces (top). The protein, shown with van der Waals surfaces (bottom), is postulated to align between two prism faces of ice (blue spheres), thereby stopping ice boundary migration and essentially acting as an interfacial "glue" to prevent ice recrystallization. See the article by Kuiper et al. on p. 3560.