Abstract
Concatemeric DNA from T7-infected cells consists of phage genomes in a linear head-to-tail arrangement. Adjacent genomes within a concatemer overlap for the length of the terminal repetition. Fast-sedimenting T7 DNA contains single-stranded regions at roughly unit-lentth intervals but these interruptions are heterogeneously distributed and do not occur at the genetic termini. Mutations in either bacteriophage genes 9, 18, or 19 (required for DNA maturation and packaging) lead to the synthesis and persistence of DNA with fewer interruptions than normal.
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