Figure 2
From: Normalization and experimental design for ChIP-chip data
Scatter plots and density contours of log-ratios for Drosophila MSL complex binding. ChIP-chip experiment versus mock controls are shown for (a) chromosome X and (b) chromosome 2L, with each point corresponding to a probe. The symmetry of the scatter plot for the 2L chromosome along the diagonal y = x confirms that there is no MSL complex binding on the 2L chromosome. 3000 of the probes (about 1.5%) were randomly selected from the X and the 2L chromosomes for visualization.