Cover photograph (Copyright © 2006, American Society for Microbiology. All Rights Reserved.): Renal epithelial cells isolated from KCP mutant mice are undergoing a transition to myofibroblasts in response to low doses of transforming growth factor β and are stained with E-cadherin (green), smooth muscle actin (red), and DAPI (4′,6′-diamidino-2-phenylindole; blue). (See related article on p. 4577.)