It’s been hard to avoid hearing about the recent study [PDF] linking GMO corn and pesticide (Roundup) exposure to tumor growth and early death in rats. Most major news organizations have picked it up, including The New York Times, the Washington Post, the Chicago Tribune, NPR, and the LA Times.

The study itself, published in the peer-reviewed journal Food and Chemical Toxicology, was performed by Gilles-Eric Seralini, head of the Committee for Independent Research and Information on Genetic Engineering and a scientist who is a self-described opponent of genetically modified food.

The group that co-sponsored the research, the U.K.’s Sustainable Food Trust, declared it to be the first “lifetime feeding trial” of GMOs’ effects in rats; Seralini and his team followed the rats for two years — the full lifespan of the animal. Most GMO rat feeding studies last no longer than 90 days — the equivalent to a much longer period in human terms, of course.