The Grueneberg ganglion, composed of about 500 neurons, is an alarm pheromone sensor. In this video, an experiment involving the removal of neurons from the Grueneberg ganglion region in certain lab mice showed a marked change in behavior around alarm pheromones.
Posted in 'How mice smell fear' at sciencenews.org/view/generic/id/35672/title/How_mice_smell_fear
Also 'FOR KIDS: Mice sense each other's fear' at sciencenews.org/view/generic/id/36209/title/FOR_KIDS_Mice_sense_each_others_fear
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