NEW YORK, May 11 – Merck has agreed to acquire Rosetta Inpharmatics in a stock-for-stock transaction worth $620 million, the companies said Friday.

The tax-free reorganization will swap each share of Rosetta stock for 0.2352 shares of Merck stock, giving a value of $18 per share of Rosetta stock, an 82 percent premium on Thursday’s closing price.

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The US Food and Drug Administration has approved Kite Pharmaceuticals' CAR T-cell therapy for large B-cell lymphomas, the New York Times reports.

Kaiser Health News reports that gene therapies could cost more than a million dollars.

Worcester Polytechnic Institute researchers have received a grant to combine biology and computer science for high school students.

In Nature this week: variants associated with obsessive-compulsive disorder, review of key CRISPR enzymes, and more.