Hole-y cow! Guts could lead to holy grail for cheap biofuels

It may not be glamorous, but the holy grail for efficient biofuels — the kind that don't compete with our food supply — could end up being found inside the guts of cows. 

In a study published Thursday in the peer-reviewed journal Science, researchers described how they incubated bags of switchgrass inside cow rumens and from that found 27,755 "candidate genes" with the potential for efficiently breaking down plant cellulose into usable sugar that can then become ethanol.

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