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Tryptophan
An amino acid found in food that is
essential to the production of the
neurotransmitter serotonin in the
brain.
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Serotonin
A brain neurotransmitter secreted by
neurones at the synapse and
thought to be important in
emotional states. Pathways using
serotonin are involved in
behavioural states such as sleep and
depression.
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Opiate
Drugs such as heroin and morphine.
Also naturally occurring
neurotransmitters in the brain,
involved in feelings of pleasure and
also in pain reduction.
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Enkephalin
An opiate neurotransmitter in the
brain. The release of enkephalin is
associated with feelings of pleasure
and euphoria.
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Beta-endorphin
An opiate neurotransmitter in the
brain similar in action to enkephalin.
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