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(Color online) Spatial segregation in an expanding microbial population. Different colors label different alleles. The Petri dish was inoculated with a well-mixed population occupying a narrow horizontal linear region between the arrows, which show the direction of the growth. As this population expands, it segregates into well-defined monoallelic domains. The colony is of the order 1 cm in height. Details of the experiment are presented in Hallatschek et al. (2007).
