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Science 13 October 2006:
Vol. 314. no. 5797, pp. 259 - 260
DOI: 10.1126/science.1133739
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Perspectives

GENETICS:
The Bacterial World Gets Smaller

Siv G. E. Andersson

Bacterial symbionts with miniscule genomes can survive by relying on gene expression by host cells or other symbionts. This system may mimic the process of organelle genome evolution.

The author is in the Department of Molecular Evolution, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18C, 752 36 Uppsala, Sweden. E-mail: siv.andersson{at}ebc.uu.se

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