 In doing so he was able to conclude that the virus was either a protein or closely related to one, thus benefiting experimental research.There are very important reasons why these new, much smaller organisms such as the Tobacco Mosaic Virus and "E. coli" made their way into the molecular biologists’ laboratories.Organisms like "Drosophila" and "Tribolium" were much too large and too complex for the simple quantitative experiments that men like Wendell Stanley wanted to perform.