About the cover: Cover is based on an image of vascular remodeling induced by exposing mice to 20 weeks of house dust mite extract (red: α-smooth muscle actin, green: procollagen I, and blue: nucleus visualized by Hoechst 33342). Small foci of procollagen I–producing cells were found unevenly distributed within the parenchyma. For more information, see article by Rydell-Törmänen and colleagues, beginning on page 61.