STRUCTURE analyses of 8,474 SNPs among 74 globally dispersed individuals. A STRUCTURE analysis revealed that the likelihood of the data was maximal at K = 4 ancestral populations (also called subgroups or clusters). Individuals are represented as vertical bars that are partitioned into segments corresponding to their membership of the clusters indicated by the four different colours. Each colour reflects the estimated relative contribution of one of the four clusters to that individual's genome and sum up to 100% (indicated at the Y-axis). Individuals were sorted according to their geographical origins (indicated below each group) after completion of the STRUCTURE analyses. E.g. for the left-most individual, sampled in Africa, there is about 82% relative contribution of the ancestral population represented by yellow, about 6% is attributed to the blue ancestral population and the remaining 12% is attributed to the red ancestral population. From this figure it becomes clear that this could be interpreted as a contribution of 82% - 12% - 6% of African, European, and Asian "genes" to the genome of this African individual. The results in this figure are based on the 8,474 SNPs genotyped in the 74 YCC cell lines from individuals from Africa (n = 25), Native American origin (n = 12), Asia (n = 14), and Eurasia (n = 23).
Kersbergen et al. BMC Genetics 2009 10:69 doi:10.1186/1471-2156-10-69