
(A) Location of conserved segments in the Caenorhabditis elegans genome. Gray bars under the autosomes show the “central clusters” described by Barnes et al. (1995). The segments cover ∼15% of chromosome I, 7% of II, 10% ofIII, 13% of IV, 15% of V, and 20% ofX. (B) Matrix plot comparison between the C. elegans genome (vertical axis) and the nine Caenorhabditis briggsae contigs (horizontal axis). Conserved segments are indicated by lines drawn between the positions of the outermost genes in each species.











