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By Denis Dumo JUBA (Reuters) - Rebel forces in South Sudan said government troops attacked their garrison in a town in the north on Tuesday, and they threatened swift retaliation, stoking fears of another full-blown military confrontation in the young nation. Political rivalry between South Sudan's president, Salva Kiir, and former vice president, Riek Machar, sparked a civil war in 2013. Although the pair signed a shaky peace deal a year ago, fighting has continued and Machar fled the country in July.
The woman, whose identity was withheld by New Scientist, and her husband sought the help of John Zhang, a doctor from the New Hope Fertility Center in New York City to have a baby that would be genetically related to them but would not carry the inherited disease. Since the mother carried the genes for the disease in her mitochondria, or DNA that is passed down from the maternal side, Zhang used her nuclear DNA and combined it with mitochondria from an egg donor, in a technique known as spindle nuclear transfer.