Cell membrane proteins that bind opioids and trigger intracellular changes which influence the behavior of cells. The endogenous ligands for opioid receptors in mammals include three families of peptides, the enkephalins, endorphins, and dynorphins. The receptor classes include mu, delta, and kappa receptors. Sigma receptors bind several psychoactive substances, including certain opioids, but their endogenous ligands are not known.

Descriptor ID	D011957
MeSH Number(s)	D12.776.543.750.100.620 D12.776.543.750.720.600.610 D12.776.543.750.750.555.610
Concept/Terms	Receptors, Opioid Receptors, Opioid Opiate Receptors Opioid Receptor Receptor, Opioid Opioid Receptors Opiate Receptor Receptor, Opiate Receptors, Opiate Receptors, Normorphine Receptors, Normorphine Normorphine Receptors Receptors, Narcotic Receptors, Narcotic Narcotic Receptors Enkephalin Receptor Enkephalin Receptor Receptor, Enkephalin Receptors, Enkephalin Enkephalin Receptors beta-Endorphin Receptor beta-Endorphin Receptor Receptor, beta-Endorphin beta Endorphin Receptor Receptors, beta-Endorphin Receptors, beta Endorphin beta-Endorphin Receptors Receptors, Endorphin Receptors, Endorphin Endorphin Receptor Receptor, Endorphin Endorphin Receptors

Below are MeSH descriptors whose meaning is more general than "Receptors, Opioid".

Below are MeSH descriptors whose meaning is related to "Receptors, Opioid".

Below are MeSH descriptors whose meaning is more specific than "Receptors, Opioid".