Analysis of intrachromosomal contacts in sperm cells and fibroblasts. (A) The ratio between intra- and interchromosomal contact numbers for sperm cells (green) and fibroblasts (blue). (B,C) The two-dimensional heatmaps show the observed number of interactions between any pair of chromosomes divided by the expected number of interactions between those chromosomes for sperm cells (B) and fibroblasts (C). The color of each dot represents the enrichment (red) or depletion (blue) of contacts compared with the expected values. (D) The observed number of interactions between any pair of chromosomes plotted against the difference in the lengths of those chromosomes. The dotted lined represents the linear trend for obtained values.