1902-1992 1996d-682 1998b-031 2002h-169 bacterialdna bacterialgenome barbara congresses dna eukaryoticcells geneexpressionregulation geneticconjugation geneticregulation genetics genome genomes insertionelements interspersedrepetitivesequences laboratorymanuals mcclintock microbialgenetics mobilegeneticelements molecularbiology moleculargenetics mutagens physiology plant plantgeneticregulation plantgenetictransformation plantgenome plantmoleculargenetics plants prokaryoticcells qu25 recombinant transposons