title: Why nuclei?
authors.affiliation: Department of Biology, Massachusetts Institute of Technology, Cambridge 02138.
authors.forename: S
authors.initials: S
authors.lastname: Penman
mesh_terms: D005075:Biological Evolution; D002467:Cell Nucleus / Q000502:physiology*; D004247:DNA / Q000235:genetics; D005057:Eukaryotic Cells / Q000648:ultrastructure
chemical_list: D004247:DNA