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H4a was found in several Neolithic European individuals, including the Cardium Pottery culture in Portugal and Spain, as well as in Neolithic Scotland and southern France, so it's likely that it originated with Middle Eastern Neolithic farmers. As it was absent from the Balkan Neolithic, I imagine it could have spread through North Africa to Iberia then Western Europe. Another possibility is by the maritime route via Anatolia, Greece and Italy, but so far it hasn't been found in these places during the Neolithic.