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Genetic principal component analysis. Scatterplots of the first two genetic principal components of ALSPAC merged with the 1000 Genomes phase 1 data set. a Clustering of superpopulations from different continents, whereas b shows clustering of populations within Europe. PC1 principal component (1), PC2 principal component (2), SD standard deviation, CEPH Centre d’Etude du Polymorphisme Humain
