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DNA mapping has also revealed some relationship to the Italian wine grape variety Lagrein grown in the Trentino-Alto Adige/Südtirol region of northeast Italy, though the exact relationship is unclear. The most recent research from Swiss grape geneticist Dr. José Vouillamoz, completed in 2006, suggests that Dureza might be an "uncle" to Lagrein and connected together by another red Italian wine grape, Teroldego.