Abstract
Bacteriophage Pl codes for a dnaB analog (ban) protein, which is repressed in wild-type P1 prophage and expressed constitutively in Plbac (dnaB analog control) mutants (3,6). E.coli dnaB(Plbac) lysogens are able to grow at temperatures that arrest DNA synthesis in the non-lysogen (3,6). In addition, Plbac ban mutants have been isolated in which the expression of the viral dnaB analog is prevented. These phage mutants do not suppress the dnaB character (3).
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