The Mediterranean Sea as a barrier to gene flow: evidence from variation in and around the F7 and F12 genomic regions.

Although the first two PCs account for 39.52% of the original variation and the separation between North Africans and South Europeans along the second PC is visually not as clear, the population clustering according to the factors used ('South Europe', 'North Africa', 'Ivory Coast' and 'South America') was highly significant (Table 2 ).

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