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184188, 1985 [36] J
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10.1210/clinem/dgaa894 16 CherneyD
2.4.4.4 Endogenous opioids There are three major types of endogenous opioid peptides that can be considered as neurotransmitters: endorphins, enkephalins, and dynorphins, which are respectively derived from three different precursor proteins: pro-opiomelanocortin (POMC), preproenkephalin A and B [86], although this number increased after the discovery of endomorphin-1 and endomorphin-2 [87]
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