Neurotensin, PYR-Leu-Tyr-Glu-Asn-Lys-Pro-Arg-Arg-Pro-Tyr-Ile-Leu, is primarily studied for its role in the central nervous system and gastrointestinal tract. It acts as a neurotransmitter and neuromodulator, influencing various physiological processes. In research, it is used to investigate its effects on dopamine signaling, which is relevant for understanding conditions like schizophrenia and Parkinson's disease. Additionally, neurotensin is explored for its potential in regulating appetite and digestion, making it a target for studies on obesity and gastrointestinal disorders. Its interactions with cancer cells are also under investigation, as it may play a role in tumor growth and metastasis, offering potential therapeutic applications in oncology.