Heterotelergones

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Heterotelergones (also known as allelochemics) are a class of biologically synthesised chemicals (includes pheromones, venom, and phytoncides) which entice, repel, immobilize, or alter tissues.

Commonly used by terrestrial plants as a form of defence against insect herbivores, and by aquatic plants as a form of defence against algae^{[citation needed]}.