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"But what was really critical was that Tu Youyou identified the active agent in that plant extract," said Zierath, adding "there was a lot of modern chemistry, bio-chemistry attached to this to bring forward this new drug."

It is also necessary for the two countries to deepen people-to-people exchanges and expand cooperation in tourism, culture, art, publication and other areas, so as to consolidate public support for bilateral relations, he added.

While addressing a peacekeeping summit, Xi expounded China's stance and principles on issues relating to world peace, put forward important proposals on promoting UN peacekeeping missions, and announced a string of practical initiatives to build peacekeeping capability readiness system and promote peacekeeping capability building of countries worldwide, especially those from Africa, Wang said.

It would be "a very healthy thing" if the two leaders could show some real progress towards reaching the treaty, said Fred Bergsten, a senior fellow and director emeritus at the Washington-based Peterson Institute for International Economics (PIIE).

Xi is scheduled to hold talks with Cameron and also meet with leaders of opposition parties and the parliament.