Figure 2

Distribution of isochores according to GC levels. The first three histograms, shown for the sake of comparison, display the distribution (by weight) of isochores as pooled in bins of 0.5% GC of some vertebrates: human [9], chicken [11] and zebrafish [10]. The bottom panels show the isochore pattern of C. intestinalis and of C. elegans. The total amount of DNA calculated from the sums of isochores, GC % and the number of isochores are reported. Colors represent the five isochore families of the human genome. Notice the different scales on the ordinate axis.