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Varmus provided further explanation about the potential benefits of somatic cell nuclear transfer; he noted that since "Dolly" (the sheep cloned in 1997) the National Bioethics Advisory Committee had concluded that human cloning should be deferred for a while, but that any legislation should be carefully written so as not to interfere with other important research. The committee planned to re-evaluate in 3-5 years. Over 67,000 scientists in this research area signed voluntary moratorium on human cloning work.. Note: Chart labels "Chart 1" and "Chart 2" are cut off at the bottom on the originals.