1887

Abstract

SUMMARY

The and phage P1 host specificity genes were introduced into by means of Hfr × F crosses. The three systems were found to govern modification and restriction of phages P22 and L. The restriction coefficients were comparable to that of λ for the PI system and were lower (about 100) for the and systems. Phage grown on and recombinants was restricted by independently of the restriction governed by the system. This observation suggested that possesses a previously undetected locus allelic to those of k and b.

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/content/journal/micro/10.1099/00221287-70-1-123
1972-04-01
2021-08-02
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