There are 2 recent but separate scientific studies. One, in June 2010 'American Journal of Human Genetics', co-autored by scientists from Europe, US, Israel. It refutes fable Jews have gentic link to Khazars. The main reason for this study is to serve as background for further research about inherited genetic illnesses. It does comport that Jews from Israel and most closely related to each other -not Arabs, a close DNA grouping, but still separate. The other study in 'Nature'. Both science publications are extremely world wide respected scientific journals.
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from the article: Landmark study proves 90% of Jews are genetically linked to the Levant