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| Modern Genetic Analysis Chapter 9. The Genetics of Bacteria and Phages Bacteriophage Genetics Figure 9-17. The appearance of phage plaques. Individual phages are spread on an agar medium that contains a fully grown "lawn" of E. coli. Each phage infects one bacterial cell, producing 100 or more progeny phages that burst the E. coli cell and infect neighboring cells. They in turn are exploded with progeny, and the continuing process produces a clear area, or plaque, on the opaque lawn of bacterial cells. (Barbara Morris, Novagen.)

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