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ABOUT THIS IMAGE. This image illustrates the serial founder model of human migrations.
Each circle represents a population, from which a subset of individuals (embedded smaller circle) moves outward to form a new population during a migration wave out of Africa. The figure is based on the work of DeGiorgio et al. (Explaining worldwide patterns of human genetic variation using a coalescent-based serial founder model of migration outward from Africa; Proceedings of the National Academy of Sciences USA 106: 16057-16062).