Figure 3

Modelling-B of size distribution of inter-CDS regions in different yeast species. Left column: between divergently transcribed genes; middle column: between co-oriented genes located on the same strand; right column: between convergently transcribed genes. Length distributions are shown separately for young gene pairs (those without neighbouring orthologs in any other yeast species) and for older gene pairs. Red lines are predictions for the 'old' distributions from a simulation of neutral rearrangements of the total distribution (see Materials and methods for details, and see Additional file 6 for an alternative neutral model). See Additional file 5 for the remaining eight species.