Neuropeptides are small protein molecules that act as signaling molecules in the nervous system. They play a crucial role in regulating various physiological processes such as pain perception, mood, stress response, and appetite. Neuropeptides are produced by neurons and released into the synaptic cleft to communicate with other neurons. Researchers study neuropeptides to understand their role in the nervous system, as well as their potential therapeutic applications for various neurological disorders. Additionally, neuropeptides have been shown to have important roles in modulating the immune system and inflammatory response.