SUMMARY: As the result of P1-mediated cotransduction with from to the hybrid 4617, one recombinant, L4004, was isolated which had a restriction-modification (R-M) system different from the SB and SP systems of its parents, and was designated SQ. The genes of SQ were allelic to those of the SB system of and were shown by complementation experiments to be functionally related to those of the K system of Evidence that the SQ system in L4004 arose as the result of a recombination event within the genes of SB and SP is discussed.


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