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Mammalian Pheromones

The term pherom one is a combination of phero (from the Greek pher[ein]f to carry or bear), o, and (hor)mone. This term was originally de­ fined by Karlson and Liischer (1959, p. 55) for insects as “substances which are secreted to the outside by an individual and received by a sec­ ond individual of the same species in which they release a specific reaction, for example, a defi­ nite behavior or a developmental process.” Food attractants, blossom fragrances, and in­ sect repellents were excluded from the term. A distinction between “releasing” and “priming” pheromones was made, the former releasing a specific behavior and the latter a developmen­ tal or neuroendocrine change.