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How mice smell fear

Mysterious structure at the tip of the nose could be a special alarm sensor.

Fear stinks. And its stench tickles a recently re-discovered set of nerves in the tip of a mouse’s nose.

Swiss researchers report in the Aug. 22 Science that they have finally found a function for a structure called the Grueneberg ganglion. The structure, composed of about 500 neurons, is an alarm pheromone sensor, say Marie-Christine Broillet, a neurophysiologist at the University of Lausanne, and her colleagues.

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