When I first learned about mitochondria and chloroplasts in school, there was little mention of their origin as bacteria. The so-called “Endosymbiont Hypothesis” (really a theory at this point) is ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 98, No. 4 (Feb. 13, 2001), pp. 1883-1888 (6 pages) Sodalis glossinidius is a maternally transmitted secondary ...

Animal gastrointestinal tracts harbor a microbiome that is integral to host function, yet species from diverse phyla have evolved a reduced digestive system or lost it completely. Whether such changes ...