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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.

Pham Binh Minh said that the Vietnamese side hopes to further enhance contacts of different levels between the two parties and two countries, and to expand bilateral cooperation on investment and trade.

The two countries also agreed to expand people-to-people exchanges and deal with the issues concerning the aging of population.

Competition venues for Beijing 2022 are split into three clusters, with curling, ice hockey and skating events due to be held in urban Beijing.

He believed that his visit would help implement the consensus reached between leaders of the two countries, deepen military and security exchanges and cooperation, and build mutual trust.