Conserved pseudogenes at syntenic locations. Each column represents a set of orthologous sequences in a region of synteny conservation. Vertical dashed lines separate the different regions. Rectangles represent annotated genes, dashed rectangles represent pseudogenes detected in this analysis. All these pseudogenes have no paralog in the genome. The topology of the species phylogeny  is given on the left of the figure (branch lengths ignored).
Lafontaine and Dujon BMC Genomics 2010 11:260 doi:10.1186/1471-2164-11-260