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It may not be considered manly for humans to cry. But when male mice shed a tear, they seem to be trying to prove their masculinity.

 

So say Japanese researchers who have discovered that male mice release pheromones in the fluid that moistens their eyes.

 

"Nobody expected that sex-specific pheromones would exist in tears," says Kazushige Touhara of the University of Tokyo in Chiba.

 

Touhara says the pheromones in these secretions are probably picked up by females when they groom the faces of their fellow mice. These sexy cues may help females to work out which of their companions are male and therefore potential mates.

 

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