Meet Pig23. Unlike the famous cloned sheep Dolly, this pig has no media friendly moniker, only a number on a tag stapled to his leaf ear. "I don't name my animals," says Karl Ebert, chief scientific officer of Midas Biologists in North Grafton, Massachusetts, and the biologist who created Pig 23 here at the Tuffs School of Veterinary Medicine. This particular animal, a male Yorkshire white, has pale pinkish skin covered with light bristles that are softer than they look, an expressive snout, and the stereotypical curly tail all in all, a very piggy pig, no difference in appearance from his thousands of cousins that end up as pork chops and ham at the butcher counter.