It's Alive!

Researchers in Japan have turned murine embryonic stem cells into fully functioning sperm, which they've also used to fertilize mouse eggs in vitro, says 80beats' Joseph Castro. When the researchers implanted the embryos via surrogate mothers, the pregnant mice produced healthy offspring.

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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.