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A spontaneous deletion mutant of bacteriophage phi 29 (phi 29 delta 1) has been characterized. This mutant has a 1112-bp deletion, which covers almost the entire sequence of genes 14 and 15, including an early promoter (B2). While lysis is very delayed, the phage DNA synthesis and internal phage development appear to be normal in the cells infected with this deletion mutant. These results indicate that the early functions are intact in phi 29 delta 1. Our results also suggest that genes 14 and 15 are dispensable for bacteriophage phi 29 growth and that the B2 promoter may also be dispensable for early functions in phi 29.
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