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"Further research may greatly assist the study of the ancestry of modern human beings not only in China, but also in the rest of East Asia, Southeast Asia and even for Native Americans," Chen said.

"For now we must keep making the choices that will reduce transmission of the virus and protect our families and our communities. By doing so we can go into 2021 with hope," Kasai said.

"Frankly, I just don't see any evidence of this," said Spence, head of Australia's oldest university, with a student body of 67,000 and 15,000 overseas Chinese students that pay high fees.

"For the sake of the country, we ask that you come to the table and work with us to produce an agreement that meets America's needs in this critical time," said the Democratic leaders.

"Following the logic of certain people, residents in Xinjiang should oppose our positive measures and live in the shadows of extremism, violence and terrorism instead; will it be the right thing?"Geng said.