To pee or not to pee

Signature pheromones in male mouse urine guide countermarking behavior

By Bethany Brookshire, 11:57 AM May 13, 2014

In humans, words have a lot of power. A text or an e-mail can turn a friend to an enemy, or a bad day into a good one. Words are the beginning of fights and the beginning of relationships. For people all over the world, the pen is mighty.

But for mice, there is no pen. There is only pee. A new study shows that certain pheromones called major urinary proteins, or MUPs, in male mouse urine form a unique signature that mice use to determine whether to mark or countermark territory. The results sh...

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