Additional file 4.
Control region haplotype network. White circles represent modern sequences, black circles represent ancient sequences, and split circles represent haplotypes present both in ancient and modern samples. Each haplotype has a unique number, and the country of origin is marked nearby, together with the number of sequences represented in brackets. For ancient samples, where available the approximate date of the sample is also given in brackets; those marked with a star '*' are dated by dendrochronology, the one sample marked with two stars '**' is radiocarbon dated, and all others are contextual dates.
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Teacher et al. BMC Evolutionary Biology 2011 11:214 doi:10.1186/1471-2148-11-214