BackgroundD-Serine. an endogenous co-agonist of the N-methyl-D-aspartate (NMDA) receptor. is synthesized from L-serine by serine racemase (SRR). Given the role of D-serine in both neurodevelopment and the pathophysiology of schizophrenia. https://www.hindigyanvishv.com/great-choice-Red-Prairie-Spy-Apple-Tree-amazing-save/