A. Circular representation. The location of predicted coding regions color-coded by biological role, repeats, insertion elements, rRNA genes, tRNA genes, sRNA genes, and transporters are indicated on the four circular molecules of D. radiodurans. B. Linear representation of the genome. Recent gene duplications between molecules (18) are linked by lines; the color of each link corresponds to particular functional categories. Recent duplications within molecules are not shown. Genes duplicated between molecules are linked by lines. Circular and linear molecules are not drawn to scale.