Chemical messenger
A chemical messenger is any compound that serves to transmit a message, and may refer to:
- Hormone, long range chemical messenger
- Neurotransmitter, communicates to adjacent cells
- Neuropeptide, a protein sequence which acts as a hormone or neurotransmitter. The blood or other body fluids transport neuropeptides to non adjacent target cells, where neuropeptides exert their effect.
- Pheromone, a chemical factor that triggers a social response in members of the same species
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