 The Tobacco Mosaic Virus has DNA that stacks itself in a distinctive way that was influential in Watson and Cricks development of their model of the helical structure for DNA.Both the community of insects and the viruses were a good start to the history of model organisms, but there are yet still more players involved.At the turn of the century much biomedical research was being done using animals and especially mammalian bodies to further biologists’ understanding of life processes.