Cover photograph (Copyright © 2007, American Society for Microbiology. All Rights Reserved.): Three-dimensional reconstruction of an embryonic tendon fascicle. The reconstruction was produced from 254 consecutive transverse sections imaged with a transmission electron microscope. Individual cells are shown in false color aligned with the long axis of the tendon oriented top to bottom. A single electron microscope image is superimposed to aid visualization. (See related article on September 2006, vol. 27: issue 17, p. 6218.)