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- Bäckhed, Fredrik, Manchester, Jill K., Semenkovich, Clay F. and Gordon, Jeffrey I. "Mechanisms underlying the resistance to diet-induced obesity in germ-free mice." Proceeedings of the National Academy of Sciences of the United States of America, Jan. 16, 2007. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pubmed&pubmedid=17210919
- Margulis, Lynn. Symbiotic Planet : A New Look at Evolution. Basic Books, March 2000.
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- University of Glasgow. "The Normal Gut Flora." http://web.archive.org/web/20040526195616/http://www.gla.ac.uk/departments/humannutrition/students/resources/meden/Infection.pdf
- Wakeford, Tom. Liaisons of Life: From Hornworts to Hippos--How the Unassuming Microbe has Driven Evolution. Wiley; New Ed edition (March 29, 2002).
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