opioid peptide

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opioid peptide

biochemistry

Learn about this topic in these articles:

neuromodulation

In hypothalamus: Hypothalamic regulation of hormone secretion
Well-known examples are the opioids (e.g., enkephalins), so named because they are endogenous (produced in the human body) peptides (short chains of amino acids) with a strong affinity for the receptors that bind opiate drugs, such as morphine and heroin.
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neurotransmitter release