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A sign hangs in front of the world headquarters of Vertex Pharmaceuticals in Boston on Oct. 23, 2019.

Vertex Pharmaceuticals will buy Alpine Immune Sciences for about $4.9 billion in cash, gaining access to the biotech firm's treatment for an autoimmune disease of the kidney, the companies said on Wednesday.

The deal values each share of Alpine at $65, representing a premium of about 67% to the stock's close on Tuesday, a day before Bloomberg News reported that the company was considering options after attracting takeover interest.

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