Preferred Label : circulating opioid factor;
MeSH note : endogenous opioid factor released into circulation in amounts which vary on a diurnal
cycle; crosses blood-brain barrier at spinal level to exert inhibitory effect on transmission
specifically in nociceptive pathways at spinal level;
MeSH synonym : CCOPF;
Is substance : O;
Origin ID : C032828;
UMLS CUI : C0615088;
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