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. 2020 Dec 3;11:115. doi: 10.1186/s40104-020-00520-8

Fig. 1.

Fig. 1

The geographical distribution, PCA plot, and phylogenetic tree of 57 pig breeds. a The geographical distribution of each major category of pig breeds. b The first two principal components derived from whole-genome SNP data. c The phylogenetic tree derived from the whole-genome SNP data. The pigs were clustered into five categories, which included Asian domestic (purple), Asian wild (orange), European domestic (green), European wild (black), and the breeds that do not belong to the above categories (blue)