Cover illustration

April 26, 2005; 102 (17)
Cover image expansion

Cover image: Section of a transgenic mouse hippocampus. Presynaptic boutons are visualized in green, and the presence of cellular nuclei, including the tightly packed layer of pyramidal neurons, is indicated in red. These transgenic mice can be used to image synaptic activity in different regions of the mouse brain. See the article by Li et al. on pages 6131–6136. Image courtesy of William J. Tyler.