SUMMARY: Some pairs of genetically marked strains of when grown together and plated under selective conditions give rise to greater number of colonies than either strain plated alone; in the case of other pairs in which this phenomenon did not occur, large number of presumptive recombinants were obtained when one of the strains was made lysogenic with a particular phage. Although the small number of markers made it impossible to do mapping studies, the evidence is strongly suggestive of recombination, probably phage-mediated transduction.


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