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. Author manuscript; available in PMC: 2010 Nov 8.
Published in final edited form as: Rev Mod Phys. 2010 Jun 1;82(2):1691–1718. doi: 10.1103/RevModPhys.82.1691

FIG. 14.

FIG. 14

(Color online) Spatial segregation in an expanding circular bacterial colony of E. coli. Different colors label different alleles. The Petri dish was inoculated with a well-mixed population occupying the circled region of the colony, leading to many small domains in the central “homeland.” As this population expands (shown with arrows), it segregates into well-defined monoallelic domains, which coalesce at early times but seem to stop coalescing in the final stages of the experiment. Note that the boundaries between the domains are biased to move away from each other due to inflation, in addition to their diffusive random-walk-like motion. Details of the experiment are presented by Hallatschek et al. (2007).