"For the first time we are actually starting to see tau therapeutics results, which is something we have never seen before, " enthuses neurologist Scott Turner of Georgetown University.

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At the same time, scientists at the UK biotechnology company Paradigm Therapeutics contacted the US doctors to tell them they had bred mice that had failed to reach puberty.

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This is the push of big pharma into less financially risky specialty therapeutics that people have been predicting for a long time.

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