Remember Snuppy, the cloned puppy? He’s been living under a cloud for a while now, since one of his creators was Woo-Suk Hwang, the Korean scientist who was found to have faked data and exploited his workers, and there was concern that perhaps the dog cloning experiment was also tainted.
Put those fears to rest. Two groups of researchers have independently analyzed Snuppy and its putative clone parent, and both agree that it is most likely a clone. The nuclear markers between the two were identical, while mitochondrial markers were different—exactly what you’d expect in this kind of clone, and not what you’d see from simple twins, for instance, or if someone had faked the samples.
Parker HG, Kruglyak L, Ostrander EA (2006) DNA analysis of a putative dog clone. Nature 440:E1-E2.
Seoul National University Investigation Committee, Lee JB, Park C (2006) Verification that Snuppy is a clone. Nature 440:E2-E3.