The cAMP Hunter OPRM1 eXpress kit provides an easy-to-use cell based assay to study drug candidates (small molecules or biologics) targeting GPCRs. This kit assesses ligand (e.g. met-enkephalin, morphine) based activation of OPRM1 GPCR activity via detection of decreasing levels of intracellular cAMP. This product uses EFC technology. The cells overexpress wild type OPRM1, a naturally Gi/Go coupled GPCR. Upon activation of OPRM1, the decrease in levels of intracellular cAMP leads to a decreased signal from EFC when the cAMP detection kit is applied. 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.