Intense transpositional activity of insertion sequences in an ancient obligate endosymbiont.

"sequences generated in this study were deposited in genbank under accession numbers eu288004-eu288015.; iswpi1 sequences were deposited in genbank under accession numbers eu288016-eu288038 and eu684314-eu684317.; sequences were deposited in genbank under accession numbers eu714507-eu714683."

"We are grateful to Vincent Doublet, Hervé Merçot, Jean Louis Picaud, Denis Poinsot, and Sébastien Verne for providing samples. We thank Daniel Guyonnet for technical assistance and Christine Braquart-Varnier and Mathieu Sicard for comments on an earlier version of the manuscript. This research was funded by the Centre National de la Recherche Scientifique (CNRS), the French Ministère de l'Education Nationale, de l'Enseignement Supérieur et de la Recherche, and the Agence Nationale de la Recherche (ANR-06-BLAN-0316). R.C. was supported by a CNRS Young Investigator ATIP award. S.P. was supported by a PhD fellowship from Région Poitou-Charentes."