Receptor for the tridecapeptide neurotensin. It is associated with G proteins that activate a phosphatidylinositol-calcium second messenger system. Abundant in cortex and hypothalamus, and lower levels seen in the heart and intestine. Expressed maximally in 7-day-old brain and expression decreases progressively until adulthood (35-day-old brain). Belongs to the G-protein coupled receptor 1 family. Neurotensin receptor subfamily. NTSR2 sub-subfamily.