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Rice, the worldıs most important cereal grain, is currently being sequenced because of its small genome size, its agronomic and cultural importance, and its syntenic relationships to all other grasses. A detailed transcription map tells us about gene distribution, refines the physical map, and enhances our ability to select clones for sequencing and to identify genes to phenotypes. On pages 525­535, Wu et al. have mapped 6591 unique ESTs to a YAC-based physical map, an expanded portion of which is shown in the box on the right. The aligned genetic (cM) and physical (kb) maps for chromosome 1 are shown on the left. Gene density appears to be highest (red) at the distal ends of the chromosome and less dense (blue) near the centromere. These figures are superimposed over Oriza sativa, subspecies japonica, cultivar Nipponbare, the strain sequenced by an international consortium.