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Cover picture: Glial cells of the retina. Astrocytes are shown in yellow, Müller cell end feet in red, and blood vessels in blue in this triple-labeled fluorescence image of the vitreal surface of the rat retina. Antibodies against glial fibrillary acidic protein (astrocytes), vimentin (Müller cells), and collagen IV (blood vessels) were used. The three-dimensional surface rendering was created from a series of confocal images. The end feet of the astrocytes and some of the Müller cells can be seen contacting the blood vessels. The width of the micrograph is 80 mm. Calcium waves propagated through astrocytes and Müller cells lead to modulation of the electrical activity of neurons directly beneath the glial cells. For details, see the article by Newman and Zahs, in this issue (pages 4022-4028). Image by Teng Wu, Kathleen R. Zahs, and Eric A. Newman.