Wired has more on the breakthrough from Korean scientists. Robert Lanza of Advanced Cell Technology comments that the researchers "have demonstrated that therapeutic cloning can work in a medically useful way. Prior to this study, there was a question as to whether it was biologically possible. ... The answer is yes, it works. And they did it in a dramatic way - they used therapeutic cloning to derive stem cells that genetically matched patients who had real diseases that could be treated using this technology." This is a large step closer to the ideal of regenerative medicine: "Now we're waiting for the clinical trials (using non-cloned embryonic stem cells) to show that they're safe. ... and then we can start thinking about perfect match cells that are 100 percent compatible with any disease you want to go for."