| second messenger |
A molecule produced inside neurons as a step in the process of communication between cells. The second messenger lets other parts of the cell know that a specific receptor has been activated, thereby completing the message carried by the neurotransmitter that bound to the receptor. Some receptors (eg, dopamine, opiate) use second messengers. Others (eg, nicotine, GABA) do not.
출처: www.addictionstudies.org/glossary_s.html
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