the occurrence of multiple insertions of tn3 within ecori fragment 9 , which contains the is1 element and a terminus of the tn4 element , is consistent with earlier evidence indicating that terminal deoxyribonucleic acid sequences of already present transposable elements may provide recognition sequences for subsequent illegitimate recombinational events .
C0012854
deoxyribonucleic acid
C0012868
transposable elements