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Kruettli A, Bouwman A, Akguel G, Della Casa P, Ruehli F, Warinner C*. 2014. Ancient DNA analysis reveals high frequency of European lactase persistence allele (T-13910) in medieval Central Europe. PLoS ONE 9(1), e86251. http://dx.plos.org/10.1371/journal.pone.0086251.