using this system , intraplasmidic recombination of a duplication within the pbr322 tetracycline-resistance gene is shown to be rec-dependent while recombination of a similar duplication within the kanamycin-resistance gene of tn903 is shown to be independent of reca , recb , recc , rece , recf and sbcb .
C0034865
recombination
C1419240
reca