Abstract
The length growth rate of an exponentially growing population of E. coli B/r was calculated from the population length and birth length distributions. Cell elongation took place at a constant rate that doubled at a certain length. This change in rate was responsible for a sudden drop in the frequency of classes of cells longer than that length. Asymmetry in cell partition was able to generate cells both shorter and longer than the expected 2-fold range, but did not greatly modify the length distribution in between.

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