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摘要

Genetic engineering has always been a bit of a botched job. At last we have the machinery to get it right-and you'll be amazed at the difference. For a handful of people, it has made all the difference. Around 20 boys, for instance, are now leading nomral lives. They no lon - Around 20 boys, for instance, are now leading normal lives - ger have to live sealed in a bubble because their immune systems cannot fight off diseases. And it's all down to gene therapy. Confused? Imagine if you had to rectify every spelling mistake in an article by adding a copy of the full corrected sentence at a random point. Well, that's pretty much how gene therapy and genetic engineering work right now. Instead of editing individual letters of the DNA code, you have to add a whole new piece of DNA, and there's no way to control where it ends up.