title: Tale of two serines.
authors.forename: E V
authors.initials: EV
authors.lastname: Koonin
authors.forename: A E
authors.initials: AE
authors.lastname: Gorbalenya
mesh_terms: D003062:Codon; D010802:Phylogeny; D012694:Serine / Q000235:genetics*; D014764:Viral Proteins / Q000235:genetics*
chemical_list: D003062:Codon; D014764:Viral Proteins; D012694:Serine