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| Modern Genetic Analysis Chapter 9. The Genetics of Bacteria and Phages Transduction Figure 9-24. Genetic map of the purB-to-cysB region of E. coli determined by P1 cotransduction. The numbers given are the averages in percent for cotransduction frequencies obtained in several experiments. Where trans-duction crosses were performed in both directions, the head of each arrow points to the selective marker with the corresponding linkage nearest to each arrow. The values in parentheses are considered unreli-able, owing to interference from the nonselective marker. (Redrawn from J. R. Guest, Molecular and General Genetics 105, 1969, 285.)

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