Science: Closing In on Cloning

In 363 tries, three rare mice and hints of things to come

In the book and movie The Boys from Brazil, a demented Nazi doctor uses blood and tissue cells from Adolf Hitler to clone dozens of copies of the German dictator in the hope that at least one of them will seize power and conquer the world. Though the cloning of human beings is likely to be confined to fantasy for decades—perhaps forever—other kinds of cloning have long been possible. The Greek word klon means twig, and the simplest kind of vegetable cloning consists of cultivating cuttings from a plant. By...

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