Tn2602 and Tnl, specifying the type I (or TEM type, alternatively) 3-lactamase was cloned onto plasmid pACYC184, and the level of in vivo transcription from each P-lactamase gene was determined by DNA-RNA hybridization. Type I 1
Salmonella naestved strain AHI-21, of calf origin, harbors a conjugative R plasmid of group H1, pTE21, which encodes resistance to chloramphenicol (Cm)
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