SRR (Serine Racemase): SRR is an enzyme that catalyzes the production of D-serine, a co-agonist of the NMDA receptor. Both are essential for neurotransmission and synaptic plasticity in the brain. Changes in SRR activity can impact glutamatergic signaling and have been associated with neurodegenerative diseases like Alzheimer’s and psychiatric disorders such as schizophrenia, highlighting its important role in brain function and mental health.