Neuronal Nitric Oxide Synthase (nNOS) is an enzyme found primarily in the brain and nervous system. It plays a crucial role in producing nitric oxide, a signaling molecule that helps regulate various functions, including blood flow and neurotransmission. nNOS is involved in processes such as learning, memory, and the modulation of synaptic activity. This enzyme is activated by calcium ions and is essential for communication between neurons. Dysregulation of nNOS can lead to various neurological disorders, highlighting its importance in maintaining healthy brain function. Understanding nNOS can provide insights into potential treatments for conditions like Alzheimer's disease and Parkinson's disease.