Of Mice and Men.

“‘People have not paid attention to this in the entire history of scientific research of animals,’ says Jeffrey Mogil, a pain researcher at McGill University and lead author of the study. ‘I think that it may have confounded, to whatever degree, some very large subset of existing research.'”

Sorry, Lenny: A new study finds a potentially problematic issue for decades of research: Mice are scared of men (or males of any species). ‘If you’re doing a liver cell study, the cells came from a rat that was sacrificed either by a man or a woman,’ Mogil says. As a result, ‘its stress levels would be in very different states.’ This, he says, could have an effect on the functioning of the liver cell in that later experiment.”