Figure 4From: The Microbial Rosetta Stone Database: A compilation of global and emerging infectious microorganisms and bioterrorist threat agentsDNA viruses. The relationships for large genome DNA viruses on this chart was derived from the work of Iyer, Aravind & Koonin, who showed the common ancestry of four large DNA virus families [72]. Noteworthy in this figure are the number of viruses that may be readily bioengineered.Back to article page