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Extrachromosomal DNA of the Symbiont Sodalis glossinidius

Centre of Infectious Diseases, College of Medicine and Veterinary Medicine, University of Edinburgh, Easter Bush, Edinburgh EH25 9RG, United Kingdom,¹ Institute of Molecular Biology and Biotechnology, FORTH, Vassilika Vouton, Heraklion 71110, Crete, Greece,² Department of Environmental and Natural Resources Management, University of Ioannina, Agrinio, Greece³

Received 28 February 2005/ Accepted 15 April 2005

The extrachromosomal DNA of Sodalis glossinidius from two tsetse fly species was sequenced and contained four circular elements: three plasmids, pSG1 (82 kb), pSG2 (27 kb), and pSG4 (11 kb), and a bacteriophage-like pSG3 (19 kb) element. The information suggests S. glossinidius is evolving towards an obligate association with tsetse flies.

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