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Westhusin's experience with cloning animals leaves him upset by all this
talk of human cloning. In three years of work on the Missy project, using
hundreds upon hundreds of dog's eggs, the A&M team has produced only a dozen
or so embryos (胚胎) carrying Missy's DNA. None have survived the transfer to a
surrogate (代孕的) mother. The wastage of eggs and the many spontaneously aborted
fetuses (胎) may be acceptable when you're dealing with cats or bulls, he argues,
but not with humans. "Cloning is incredibly inefficient, and also dangerous," he
says.
Even so, dog cloning is a commercial opportunity, with a nice research
payoff. Ever since Dolly the sheep was cloned in 1997, Westhusin's phone has
been ringing with people calling in hopes of duplicating their cats and dogs,
cattle and horses. "A lot of people want to clone pets, especially if the price
is right," says Westhusin. Cost is no obstacle for Missy's mysterious
billionaire owner; he's put up $3.7 million so far to fund A&M's
research.
Contrary to some media reports, Missy is not dead. The owner wants a twin
to carry on Missy's fine qualities after she does die. The prototype is, by all
accounts, athletic, good-natured and supersmart. Missy's master does not expect
an exact copy of her. He knows her clone may not have her temperament. In a
statement of purpose, Missy's owner and the A&M team say they are "both
looking forward to studying the ways that her clones differ from Missy."
Besides cloning a great dog, the project may contribute insight into the
old question of nature vs. nurture. It could also lead to the cloning of special
rescue dogs and many endangered animals.
However, Westhusin is cautious about his work. He knows that even if he
gets a dog pregnant, the offspring, should they survive, will face the problems
shown at birth by other cloned animals: abnormalities like immature lungs and
heart and weight problems~ "Why would you ever want to clone humans," Westhusin
asks, "when we're not even close to getting it worked out in animals yet?
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