So... why on earth aren't they tumbling down CYDYs

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So... why on earth aren't they tumbling down CYDYs door and "assaulting" NP for an opportunity to bid a BO???

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They would probably have a shareholder revolt if they ponied up $15 billion for a buyout of a sub $150 million dollar company. They are also probably adverse to licensing commercialization of a drug that's a direct competitor to their own.