different between opioid vs dynorphin

English

From opium +? -oid.

opioid (plural opioids)

A substance that has effects similar to opium.
(physiology) Any of the natural substances, such as an endorphin, released in the body in response to pain.
(pharmacology) Any of a group of synthetic compounds that exhibit similarities to the opium alkaloids that occur in nature.

dynorphin (plural dynorphins)

(biochemistry) Any of a class of opioid peptides that arise from the precursor protein prodynorphin

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