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Archaeologists have observed similarities in the tools, such as bidirectional blades, uncovered at the Neolithic-period Mesopotamian settlement of Çayönü Tepesi and those uncovered at roughly contemporaneous settlements elsewhere in Southwest Asia, including those in the South Levant, Central Anatolia, and Central Zagros. Although similarities in tools could be attributed to imitative behavior or trade, Nefize Ezgi Altınışık et al. found evidence of genetic affinity among the populations of Çayönü Tepesi, Central Anatolia, the South Levant, and—to a lesser extent—Central Zagros.