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. Author manuscript; available in PMC: 2014 Aug 4.
Published in final edited form as: Neurobiol Aging. 2012 Mar 23;33(8):1849.e5–1849.18. doi: 10.1016/j.neurobiolaging.2012.02.014

Fig. 7.

Fig. 7

Multidimensional scaling (MDS) plot depicting the principal component analysis of Merged Data 3. Population stratification was tested using HapMap data #23 as reference. UK and USA and HapMap CEU samples formed a single cluster (shown inside the dashed rectangle). Up-pointing triangles represent Asian (CHB/JPT) population (bottom left), and right-pointing triangles represent Yoruba (YRI) population (top left). One HapMap individual from the Asian samples appears to have dual ethnicity. The diagram on the right shows a magnified section including UK, USA, and HapMap CEU samples.