Summary: Bacteriocin production by 97 isolates of was investigated and two types of bacteriocins were identified and designated and on the basis of their size. Three isolates appeared to carry determinants of bacteriocin production which were self-transmissible at frequencies of 10 to 10, suggesting the presence of bacteriocinogenic plasmids in these strains. The mobilization of chromosomal genes was associated with transfer of the bacteriocinogenic plasmids. Indirect evidence that the production of bacteriocins may be determined by plasmids in three other strains is presented.


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