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The Marsh Arabs are interesting. Unlike other Arab groups, they have a relatively high frequency of both J1c3 and J1*. This is what Nadia Al-Zahery* had to say, in her recent paper, regarding J1* in Mesopotamia:
*Al-Zahery et al., BMC Evolutionary Biology 2011, 11:288, "In search of the genetic footprints of Sumerians: a survey of Y-chromosome and mtDNA variation in the Marsh Arabs of Iraq"In the less frequent J1-M267* clade, only marginally affected by events of expansion, Marsh Arabs shared haplotypes with other Iraqi and Assyrian samples, supporting a common local background.
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