Pheromone

A pheromone is a chemical secreted by a lifeform, that has an effect on another lifeform.

Locator bombs work by homing in on an individual's pheromones. 

Orion slave girls secrete a highly-potent pheromone that accelerates the metabolisms of males of many species, raising adrenaline production to dangerous levels. It causes aggression and a form of delusion that makes them susceptible to suggestion. The pheromone causes headaches in Human females and disrupts the sleep cycle of Denobulan males; Vulcans, however, are immune. The pheromone's effects are cumulative: the longer one is exposed, the more pronounced the results. In 2155, Dr. Phlox of the theorized that the pheromone acts as a defense mechanism against competition. 

In 2370, Captain Picard used pheromones from Deanna Troi to lure Worf while they all suffered from Barclay's Protomorphosis Syndrome. 

Ramurans produce pheromones that prevent the formation of long-term memory engrams in other species they interact with. 

In 2375, One, an advanced Borg drone with 29th-century technology, detected an elevated pheromonal response in a USS Voyager crew member, indicating that she was afraid of him. 

In The Adventures of Captain Proton holoprogram, the character of Queen Arachnia had in her possession a small vial of her pheromones, which she could use to seduce and control others. Kathryn Janeway, as Arachnia in 2375, used these pheromones against the character of Lonzak. 

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Pheromon