“Buchnera only have 600 genes, compared to about 4,000 or 5,000 for E. coli … This is a recurring pattern in the genomes of both bacterial symbionts and pathogens, but why do they get so small? … while part of the reduction is due to adaptation, a lot of it just reflects genetic drift … It's just a consequence of long-term evolution in a restricted environment with small population sizes.”

— Nancy A. Moran

as quoted by Nick Zagorski in: [Profile of Nancy A. Moran, Proceedings of the National Academy of Sciences, 22 November 2005, 102, 47, 16916–16918, 10.1073/pnas.0508498102, http://www.pnas.org/content/102/47/16916]

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Nancy A. Moran 9

American biologist 1954

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