Figure 3

Overlap analysis of ChIP-Chip experiments. For each ChIP data set a cut-off was chosen to select ~1000 probes with the highest ChIP signal (or the lowest signal for the crosslinking experiment). The overlap (yellow) shows how often the signal is beyond this cut-off at similar positions in the two compared data sets (red and green). Corresponding numbers of probes are given below the Venn diagrams.