title: Microbial Evolution: Xenology (Apparently) Trumps Paralogy.
abstract: Within-genome gene duplication is generally considered the source of extra copies when higher dosage is required and a starting point for evolution of new function. A new study suggests that horizontal gene transfer can appear to play both roles.
authors.affiliation: Department of Biochemistry and Molecular Biology, Dalhousie University, PO Box 15000, Halifax, Nova Scotia B3H 4R2, Canada.
authors.forename: Laura
authors.initials: L
authors.lastname: Eme
authors.affiliation: Department of Biochemistry and Molecular Biology, Dalhousie University, PO Box 15000, Halifax, Nova Scotia B3H 4R2, Canada. Electronic address: ford@dal.ca.
authors.forename: W Ford
authors.initials: WF
authors.lastname: Doolittle