Figure 7: Distribution of (G+C) content in the mouse (blue) and human (red) genomes.
From: Initial sequencing and comparative analysis of the mouse genome

Mouse has a higher mean (G+C) content than human (42% compared with 41%), but human has a larger fraction of windows with either high or low (G+C) content. The distribution was determined using the unmasked genomes in 20-kb non-overlapping windows, with the fraction of windows (y axis) in each percentage bin (x axis) plotted for both human and mouse.