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Cover picture: Brain hemisphere of an enhancer trap line of Drosophila malanogaster showing the fly's circadian pacemaker neurons double-labeled with anti-"pigment-dispersing hormone" (red) and green fluorescent protein (GFP; green) plus many additional GFP-positive neurons. For details, see the article by Helfrich-Förster et al., in this issue (pages 3339-3353).