NEW YORK, March 28 - Cytyc will extend the expiration date of its offer to acquire Digene after the US Federal Trade Commission asked the company for more information about the proposed deal.

The exchange offer, originally slated to expire on March 28, will now end on April 11.

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The US Food and Drug Administration has new guidelines that enable some gene and cell therapies to undergo expedited review, according to the New York Times.

Using gene drives to control invasive species might be too risky, an initial advocate of the approach says.

In Science this week: intellectual property experts argue patent battles such as the one over CRISPR are wasteful, and more.

Researchers have grown tumors in 3D cell cultures to better understand cancer, the Economist reports.