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Number of genes that are shared by at least 80%–100% of prokaryotic genomes. The points at the extreme right of the All Categories curves represent the end points from Figure 1 (for consensus gene names, CGN), and from Table 1 (for reciprocal best matches, RBM), respectively. Toward the left are genes that are cumulatively shared by progressively fewer genomes. Also shown are consensus gene names by functional category, extrapolated from COG assignments (Tatusov et al. 1997).
