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Genetic population structure in 183 Atlantic cod specimens. (A) PCA based on 99,819 SNPs. Ancient specimens (stars) were projected onto the first two principal components calculated by using individuals from modern populations (circles). (B) ADMIXTURE ancestry components (k = 2) for modern and ancient specimens. The width of the bar for ancient specimens is widened to aid visualization. LG01, 02, 07, 12, and unplaced scaffolds were excluded from these analyses (Results for explanation).
