NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,300 terms related to cancer and medicine.
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- listen (en-DOR-fin)
- One of several substances made in the body that can relieve pain and give a feeling of well-being. Endorphins are peptides (small proteins) that bind to opioid receptors in the central nervous system. An endorphin is a type of neurotransmitter.