Abstract
The mechanism by which the growth of phage BF23 is arrested in cells carrying colicinogenic factor Ib involves certain phage-specific pre-early proteins. BF23 induces the extensive formation of proteins lc and ld, but very little formation of protein le, whereas BF23h − (a mutant that is not arrested in cells carrying colicinogenic factor Ib) induces very small amounts of proteins lc and ld, but extensive amounts of protein le. Proteins lc and ld may be oligomers of protein le, and it is the presence of these putative oligomers that is necessary for the arrest of phage growth.
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