More than 15,000 people arriving in Boston for the Biotechnology Industry Organization convention opening Monday will see a Massachusetts life sciences sector that has grown and changed noticeably since the city last played host to BIO in 2007. Big Pharma has claimed a larger role, adding the resources of more global drug makers to a Massachusetts biomedical cluster that already included more than a dozen teaching hospitals, one of the nation’s largest concentrations of venture capital firms, and about 500 biotechnology companies.
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