title: Was the nucleus the first endosymbiont?
authors.affiliation: Molecular Biology Institute, University of California, Los Angeles 90024.
authors.forename: J A
authors.initials: JA
authors.lastname: Lake
authors.forename: M C
authors.initials: MC
authors.lastname: Rivera
mesh_terms: D005075:Biological Evolution; D002467:Cell Nucleus / Q000502:physiology*; D005057:Eukaryotic Cells; D000069497:Origin of Life; D013559:Symbiosis