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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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