Insights into the 'isolation' of the Basques: mtDNA lineages from the historical site of Aldaieta (6th–7th centuries AD) Concepción de la Rúa, Agustin Azkarate, Cristina Albarrán, Neskuts Izagirre, Ainhoa Alzualde, S. Alonso, Á. Alonso • 2006