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. 2014 Dec 6;4(6):20140002. doi: 10.1098/rsfs.2014.0002

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© 2014 The Author(s) Published by the Royal Society. All rights reserved.

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Figure 6. — Simulation 2: a metabolite can switch from an attractant to a repellent at very high concentration. (a) Exemplar trajectory showing more running at the right side of the simulation box, and more tumbling in the middle of the box. (b) The experienced local external metabolite concentration indicates that the bacterium in (a) migrated from a high external metabolite concentration area to a medium concentration area. (c) As the bacterium in (a) moves to a medium metabolite concentration, the signal from cytoplasmic sensory cluster saturates. (d) The distribution of 50 simulated independent bacteria clearly exhibits accumulation in the middle of the box. (e) Corresponding endpoints of 50 trajectories. (f) The range of the metabolite concentration is twice as large as in the previous simulations in figure 5. (Online version in colour.)