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PCA plots and clustering of allele frequencies based on outliers. Hierarchical clustering was implemented in heatmap using Euclidean distance with the Ward clustering method. (a) PCA plotting in 10 populations; (b) allele frequency clustering in 10 populations; (c) PCA plotting in populations XM, ZH, NI and IK; (d) allele frequency clustering in populations XM, ZH, NI and IK.
