Li X, Scanlon MJ, Yu J (2015) Evolutionary patterns of DNA base composition and correlation to polymorphisms in DNA repair systems. Nucleic Acids Res 43: 3614-3625.
This paper shows striking patterns of base compositions. One of these as shown in supplementary figure 1 is that simple species such as bacteria show the widest range of base composition variation whereas primates show the least. This is of course expected from the MGD hypothesis. I only noticed this after meeting with the senior author of the paper.