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. 2017 May 17;7:2061. doi: 10.1038/s41598-017-01565-y

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© The Author(s) 2017

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Time constant, i.e. the time it takes for a running cell to lose the original orientation, vs. cell length. Blue circles represent control cells, and red squares represent cephalexin treated cells. Error bars are the 95% confidence intervals of the linear regression least-squares estimate of the time constant (see Methods). Vertical dotted line marks the average length of untreated E. coli. Solid line is the theoretical time constant of an ellipsoid of revolution. Note the base-2 logarithmic axis for cell length.