`  == heading: ``historic non-European admixture`` ==  This section heading gives a misleading and strange effect. When we speak about the components making up European genetic diversity, we are always talking about ``admixture`` from outside Europe, so why use this term only for a section about Berbers in more recent millenia? On the other hand it would also be strange to mention ``non-European admixture`` at every heading. The emphasis of the section titles should only be on the period, OR else the geographical vector of entry being discussed. In fact, I believe the article should be structured around vectors of entry instead of periods by the way, because for each case of clear genetic immigration there are debates about which period it happened in, including E-M81. This would also help make the Cavalli-Sforza ``classical`` work relevant, because their principal components fit well within later work when looked at this way.  `