Protectedy-L-Glutamyl-L-glutamic Acid. A short peptide found in Lentinus edodes, asparagus shoot and tabacco cells.y-L-Glutamyl-L-glutamic Acid is a partial agonist at the N-methyl-D-aspartate receptors in cultured cerebellar granule cells. A substrate fory-glutamyl transpeptidase (y-GTP).Solubility:Acetonitrile, CDCl3, Dichloromethane