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Using the CRISPR-Cas9, Qin's team removed the DNA at the telomeres, the ends of chromosomes that protect them from degrading. They also snipped out the centromeres, sequences in the middle that are important to DNA replication, the paper said.

Han Jingyi, deputy mayor of Xiamen and head of the organizing committee, said the fair will focus on the Belt and Road Initiative, especially the 21st Century Maritime Silk Road.

A 21-gun salute was fired while Xi and his wife Peng inspected the guard of honor. Xi held cordial talks with the vice president and the crown prince.

Starting this year, China has launched a massive institutional reform touching upon a wide range of entities of the Party and state.