Neurotensin receptors are transmembrane receptors that bind the neurotransmitterneurotensin.[1][2] Two of the receptors encoded by the NTSR1 and NTSR2 genes contain seven transmembrane helices and are G protein coupled. Numerous crystal structures have been reported for the neurotensin receptor 1 (NTS1).[3] The third receptor has a single transmembrane domain and is encoded by the SORT1 gene.