Pheromone insect, mass spectrum

A typical result is the E.I. mass spectrum for the alarm pheromone of the honey bee. The bees check every insect coming into the hive for strangers. If a strange insect (even a bee from another hive) is detected, an alarm pheromone is released and the intruder is attacked. The pheromone is a simple volatile organic molecule having this mass spectrum. 

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