Figure 8

Gene density. The histograms represent the gene density, as density of available genes per megabase, in the five isochore families (L1, L2, H1, H2 and H3) for chimpanzee, dog, mouse, opossum and platypus; the data published on human, chicken [7] and fishes [6] are reported for the sake of comparison. The gene density for xenopus is calculated on scaffolds partitioned into non-overlapping 100 kb windows, according to the borders of human isochore families.