Cover photograph (Copyright © 2003, American Society for Microbiology. All Rights Reserved.): Delivery of adeno-associated virus vector AAV/21-CMV-EGFP to the retina of a fetal mouse on embryonic day 14 results in expression of green fluorescent protein in the retinal pigment epithelium. (Top) Section of head at birth (low magnification). (Bottom) Histological analysis of green fluorescent protein localization in an adult retina. (See related article on page 7957.)