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South Korea said on Tuesday it asked the United States to accept another year's delay in the drafting of a divisive treaty banning human cloning to allow time for a U.N. conference on the pros and cons of embryonic stem cell research.

South Korean U.N. envoy Hahn Myung-jae told Reuters he proposed the idea to a U.S. diplomat on Monday to allow for a U.N. scientific conference in February on the merits of stem cell studies.

All U.N. members agree on a treaty that would prohibit the cloning of human beings, an idea first proposed in 2001.

But treaty writers have since been tied up in knots over a push led by the United States and Costa Rica to expand the treaty to ban both the cloning of human beings and the cloning of human embryos for stem cell or similar research, known as "therapeutic cloning."

The stem cell controversy has become a focus of the U.S. presidential election campaign, with President Bush opposing government funding for any research involving the future destruction of human embryos, and his Democratic opponent...