Spontaneous inactivation of enkephalin.
D000818:Animals; D001921:Brain / Q000378:metabolism; D002462:Cell Membrane / Q000378:metabolism; D004355:Drug Stability; D004723:Endorphins / Q000378:metabolism; D004745:Enkephalins / Q000378:metabolism; D007700:Kinetics; D008297:Male; D051381:Rats; D011957:Receptors, Opioid / Q000378:metabolism; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors
D004723:Endorphins; D004745:Enkephalins; D011957:Receptors, Opioid