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KnR transductants derived from supernatants of AS207 CTXET∷Kn contain a plasmid with sequences from both the CTXET∷Kn prophage and the downstream CTXcalc prophage. A specific hybrid plasmid (pCTXETH1-Kn) is always produced; neither alternate hybrids nor the CTXET-Kn RF are ever detected. H, HindIII; N, NotI.
