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They tested a direct descendant of the mongol Khan in Iran.
Turned out he was: O-M175
"Mahmud Ghazan (5 November 1271 – 11 May 1304) (Mongolian: Газан хаан, Persian: غازان خان, Ghazan Khan, sometimes referred to as Casanus by Westerners[2]) was the seventh ruler of the Mongol Empire's Ilkhanate division in modern-day Iran from 1295 to 1304. He was the son of Arghun, grandson of Abaqa Khan and great-grandson of Hulagu Khan continuing a long line of rulers who were direct descendants of Genghis Khan."
This means Öljaitu was also O-M175.
Supposedly there is a study about multiple lineages of Khans & Shahs of Iran coming out in 2022.
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