Cover photograph (Copyright © 2008, American Society for Microbiology. All Rights Reserved.): Sporulating Bacillus subtilis cells expressing SpoVE-GFP under the control of PspoVE. Cells were imaged using fluorescence microscopy 2.5 h after resuspension to initiate sporulation. Cell membranes were stained with FM4-64. (See related article on page 363.)