Used in neuroscience research to quantify neurotensin levels in rat brain tissue, cerebrospinal fluid, or plasma. Helps investigate the role of neurotensin in neuropsychiatric disorders such as schizophrenia, addiction, and stress responses. Also applied in studies on pain modulation, feeding behavior, and dopamine regulation. Enables high-throughput screening of drug effects on the neurotensin system in preclinical models.