Figure 6From: The process of genome shrinkage in the obligate symbiont Buchnera aphidicolaRelative positions of orthologs in the Buchnera and the E. coli genomes, with the origin of replication for each genome at the origin. Each gene is positioned by its starting base within each genome. Despite the difference in genome size, an X-pattern is evident, indicating preservation of the relative absolute distance from the origin of replication.Back to article page