About the Cover
Cover image
On the cover: A sphere of ureter-like tissue, formed by grafting ES cell-derived ureteric bud into the peri-Wolffian mesenchyme of an embryonic kidney in culture. The ES cell-derived urothelium expresses markers such as uroplakin (magenta), and host cells organize around it to make smooth muscle layers (green). Image supplied by May Sallam, University of Edinburgh, Edinburgh, Scotland