title: Archaeal and bacterial hyperthermophiles: horizontal gene exchange or common ancestry?
authors.affiliation: Department of Microbiology, University of Illinois at Urbana-Champaign, IL 61801, USA. nikos@darwin.life.uiuc.edu
authors.forename: N C
authors.initials: NC
authors.lastname: Kyrpides
authors.forename: G J
authors.initials: GJ
authors.lastname: Olsen
mesh_terms: D001105:Archaea / Q000235:genetics*; D001419:Bacteria / Q000235:genetics*; D010802:Phylogeny