\ˈə͡ʊpɪˌɔ͡ɪd ɹɪsˈɛptə], \ˈəʊpɪˌɔɪd ɹɪsˈɛptə], \ˈəʊ_p_ɪ__ˌɔɪ_d ɹ_ɪ_s_ˈɛ_p_t_ə]\
Definitions of OPIOID RECEPTOR
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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.
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