title: [Use of the degeneracy of the genetic code by selective pressure to cut up genes of procaryote genomes].
abstract: The DNA sequences of three bacteriophages are analysed in order to localise those parts coding for a protein. A weak stability on the DNA molecule allows us to characterize the beginning and the end of genes. A survey of the codons used shows that the cause for this weak stability is the systematic use of A-T bases in third position, which is made possible by the degeneracy of the genetic code.
mesh_terms: D010584:Bacteriophage phi X 174 / Q000235:genetics; D001435:Bacteriophages / Q000235:genetics*; D001482:Base Composition; D001483:Base Sequence; D003062:Codon / Q000032:analysis*; D004279:DNA, Viral; D005815:Genetic Code; D012333:RNA, Messenger / Q000032:analysis*; D012641:Selection, Genetic
chemical_list: D003062:Codon; D004279:DNA, Viral; D012333:RNA, Messenger
vernacular_title: Utilisation de la dégénérescence du code génétique par la pression de sélection pour le découpage en gènes du génome des procaryotes.