London's Shire said it was seeking to buy U.S. firm Baxalta in a $30 billion deal to create a global specialist in medicines treating rare diseases.
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Dan Mangan is a reporter covering health care for CNBC.com.
Meg Tirrell joined CNBC in April 2014 as a general assignment reporter focusing on biotechnology and pharmaceuticals.
Bertha Coombs is a general assignment reporter for CNBC, covering financial markets and business news stories.