Lineage-Specific Gene Expansions in Bacterial and Archaeal Genomes

I. King Jordan1, Kira S. Makarova1,2,3, John L. Spouge1, Yuri I. Wolf1,3, and Eugene V. Koonin1,4 National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland 20894, USA; 2Uniformed Services University of the Health Sciences, Bethesda, Maryland 20894, USA; 3Institute of Cytology and Genetics, Russian Academy of Sciences, Novisibirsk 630090, Russia