With big pharma in many cases absent from the game, biotech entered the field.

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As analysts at Credit Suisse also note, there is a scarcity of pure play antibody companies, and Regeneron is now the largest biotech player focused almost exclusivity in this field.

FORBES: The Logic Of Biologics - Is Regeneron The Next Genentech?

Some of the world's biggest drug and biotech firms are entering the once-neglected field, including Novartis, Biogen Idec and Merck.

FORBES: Magazine Article