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 affect glutamatergic signaling and have been linked to neurodegenerative diseases like Alzheimer’s as well as psychiatric disorders such as schizophrenia, emphasizing its crucial role in brain function and mental health.