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Glycyl-L-glutamic acid is a neurotrophic factor (NF) in vivo, and exerts function of maintenance of AChE content and activity. Glycyl-L-glutamic acid doesn’t act directly on AChE synthesis, and may prevent preganglionic neuronal degeneration[1][2].

ChEBI: A dipeptide formed from glycyl and L-glutamic acid residues.

[1] Koelle GB, et al. Glycyl-L-glutamine, a precursor, and glycyl-L-glutamic acid, a neurotrophic factor for maintenance of acetylcholinesterase and butyrylcholinesterase in the preganglionically denervated superior cervical ganglion of the cat in vivo. Proc DOI:10.1073/pnas.82.15.5213
[2] Yourick JJ, et al. Regeneration of acetylcholinesterase in clonal neuroblastoma-glioma hybrid NG108-15 cells after soman inhibition: effect of glycyl-L-glutamine. Cell Biol Toxicol. 1991 Jul;7(3):229-37. DOI:10.1007/BF00250977