The PathHunter HCRTR2 Total GPCR internalization eXpress kit provides an easy to-use cell based assay to study drug candidates (small molecules or biologics) affecting GPCR activation and internalization. This kit uses EFC technology to measure ligand-induced internalization of HCRTR2 via detection of localization to the early endosome. The included cell line overexpresses ProLink-tagged HCRTR2 and an EA-tagged early endosome protein. Upon ligand-induced receptor activation, resulting internalization of the HCRTR2 receptor to the early endosome leads to production of EFC signal. eXpress kits are a convenient, ready-to-use format which contains all materials needed to run the assay, including single-use vials of cryopreserved cells, cell plating media, detection reagent, and assay plates. For detailed product information, User Manual and Datasheet, visit www.discoverx.com/express.