PCA plots of the first and second PCs for: (a) All samples; (b) the Old World samples (i.e. excluding Bolivians); (c) the Mediterranean samples only. The percentage of variation explained by each PC is shown in brackets. North African populations are represented by a triangle, South European populations by a square, Native Americans by a diamond and the Ivory Coast by a circle. PC Analyses were based on data from both the F7 and the F12 genomic regions.
Athanasiadis et al. BMC Evolutionary Biology 2010 10:84 doi:10.1186/1471-2148-10-84