Cover picture: This image is taken from a series of paintings based on an image of the hippocampus of fosGFP transgenic mice after sensory stimulation. The painting belongs to a larger body of work inspired by the textures, artificial luminescence, and typographical character of imaging fosGFP fluorescence in the brain. Color and texture are overlaid to create the sense of depth and complexity issue found in living brain tissue. Oil on canvas, 3 X 4 ft. Artist: Joana Ricou (www.andrew.cmu.edu/user/ jiricou; e-mail: jiricou@andrew.cmu.edu). For details, see the article by Barth et al. in the July 21, 2004 issue (pages 6466–6475).