Representation of the first two principal factors. (Bas) Basques; (Cas) Castilians; (NE) Northern Europeans from the CEPH panel; (Fin) Finns; (Jap) Japanese; (Ken) Kenyans; (Mel) Melanesians; (Mok) Moksha; (Saa) Saami; (Sur) Surui; (UK) British; (Waf) West Africans; (Zbw) Zimbabweans. Statistical significance for this representation can be obtained by working out the absolute contribution of each population to the definition of the axes. Thus, the percentage values indicate the contribution of the African populations to the first axis; the contribution of the rest of the populations refer to the second axis.