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Most people talk about pheromones as if there is one single chemical. Wrong. There are many different types of chemicals that act as smell-signals.
Not all pheromones are related to sex – pheromones can communicate many things. Ants use them to mark trails to food. When dogs mark fireplugs, they leave a lot of information about themselves – think of it as the neighborhood bulletin board for the canine community.
There are at least 3 types of sex-related pheromones in mammals that have been characterized by biologists:
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