Washington—Sheep cloner Ian Wilmut, PhD, of the Roslin Institute in Scotland, recently said that for human cloning to succeed, "we need a step as big as the one that produced Dolly" (see accompanying story).
If that step ever comes, it will likely involve the nascent field of epigenetics, literally, "after genetics." With the Human Genome Project nearing completion, scientists at the edge of biology are surveying enigmatic cellular processes that are perhaps as fundamental to life as DNA itself.
Vastag B. Epigenetics Is Seen as Possible Key to Cloning. JAMA. 2001;286(12):1438-1440. doi:10.1001/jama.286.12.1438-JMN0926-2-1