By any measurement the U.S. biotechnology industry is the envy of the world. Perspectives on the reasons for the nation's dominance in this sector are provided by the latest Scientific American Worldview Scorecard, which for the past five years has been ranking countries on their global competitiveness in biotechnology. The 2013 edition reflects increased global competition and a growing list of countries being added to the rankings.
Embryonic stem cells have been the subject of so many political fights that it's easy to forget they have also faced formidable scientific obstacles.
But they have. Human eggs, it turns out, are far more fragile than those of most other mammals – including those of other primates. And so, methods that have been used to clone mammals from Dolly the sheep to Snuppy, the cloned dog that was South Korean stem cell scientist Woo-Suk Hwang's only non-fraudulent claim to fame, have failed to produce therapeutically cloned human embryonic stem cells. Until now.
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