G-Q

The dipeptide Gly-Gln, which is naturally derived from the posttranslational processing of ?-endorphin, exhibited an inhibitory action on cell firing when applied iontophoretically to brainstem neurons in the rat. Moreover, it seems to be a neurotrophic regulator of acetylcholinesterase in the mammalian sympathetic ganglion. Gly-Gln suppressed morphine withdrawal symptoms in rats.