title: Response to Dagan and Martin.
authors.forename: Anthony M
authors.initials: AM
authors.lastname: Poole
authors.forename: David
authors.initials: D
authors.lastname: Penny
mesh_terms: D001105:Archaea / Q000502:physiology*; D005075:Biological Evolution; D005057:Eukaryotic Cells / Q000502:physiology*; D022761:Gene Transfer, Horizontal; D008928:Mitochondria; D010587:Phagocytosis; D010802:Phylogeny