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The multisite mutant Salmonella typhimurium proAB 47 was infected with phage P 22 from a suspension mediating restricted transduction of proline markers. Evidence was obtained which supports the conclusion that proAB 47 forms only a few colonies by the mechanism of restricted transduction, and that the near absence of this class of transductants is responsible for the low frequency of incorporation of the pro + marker by this strain.
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