title: Evolution of cell-cell signaling in animals: did late horizontal gene transfer from bacteria have a role?
authors.affiliation: National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA.
authors.forename: Lakshminarayan M
authors.initials: LM
authors.lastname: Iyer
authors.forename: L
authors.initials: L
authors.lastname: Aravind
authors.forename: Steven L
authors.initials: SL
authors.lastname: Coon
authors.forename: David C
authors.initials: DC
authors.lastname: Klein
authors.forename: Eugene V
authors.initials: EV
authors.lastname: Koonin
mesh_terms: D000818:Animals; D001419:Bacteria / Q000235:genetics* / Q000472:pathogenicity*; D001435:Bacteriophages / Q000502:physiology*; D005075:Biological Evolution; D002450:Cell Communication; D022761:Gene Transfer, Horizontal / Q000502:physiology*; D010802:Phylogeny; D015290:Second Messenger Systems / Q000502:physiology*; D015398:Signal Transduction