Figure 2

Distributions of intra- and inter-genomic similarity scores and their ratios. Intra-genomic combinations are all combinations between proteins common to a single genome (green bars); inter-genomic combinations are all the combination between proteins from one species to proteins from the four other species (red bars). The y-axis on the right of each plot shows the fraction of combinations which fall within a given range, where all green bars sum to 1 and red bars sum to 1. The blue and gold lines show the ratio between the cumulative fractions of inter- to inter-genomic combination. The y-axis on the left of each plot corresponds to the blue line; the gold line corresponds to a unified scale in all graphs (0 to 500). (A) The distributions of the tau rank correlation coefficients calculated between the rank-BLAST profiles of pair combinations. (B) The distributions of the P values for the hypergeometric probability calculated for the correlation-profiles of pair combinations.