The PathHunter U2OS PDGFRa Bioassay Kit provides an easy-to-use cell based assay to measure drug potency and detect neutralizing antibodies. This bioassay asseses ligand (e.g. Recombinant Human Growth Hormone) based on activation of PDGFRa Kinase activity via detection of SH2 Recruitment. The included cell line overexpresses ProLink-tagged PDGFRa and EA-tagged . Activation of PDGFRa stimulates the recruitment of and produces EFC signal. Bioassay 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, control agonist, detection reagent, and assay plates.