The PathHunter KDR Activity eXpress kit provides an easy-to-use cell based assay to study small molecule drug candidates targeting RTKs. This kit assesses RTK activation via detection of resulting KDR phosphorylation-induced SH2 domain protein recruitment. This product uses EFC technology. The cell line overexpresses ProLink-tagged fusion of the KDR kinase domain with transmembrane and extracellular ligand binding domain of EGFR; and also an EA-tagged SH2 domain protein. Upon ligand induced receptor activation, cross-phosphorylation of the receptor leads to SH2-EA recruitment and 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.