Cover photograph (Copyright © 2008, American Society for Microbiology. All Rights Reserved.): Scanning electron micrograph showing a mouse cochlea at P4. Female transgenic mice mosaic for myosin VIIa expression demonstrates morphological (both insets) and immunohistochemical (bottom inset) differences between myosin VIIa-deficient (left) and complemented (right) auditory hair cells in adult (top inset) and developing cochleae (bottom inset). Lack of myosin VIIa immunoreactivity (green in bottom inset) corresponds with the disorganized bundles of stereocilia on the apical surfaces of hair cells. (See related article on page 1702.)