The PathHunter VISTA/VISTA Dimerization eXpress kit provides an easy-to-use cell based assay to study drug candidates (small molecules or biologics) targeting receptor-receptor interaction. This kit assesses ligand induced dimerization of VISTA/VISTA receptors. This product uses EFC technology. The cell line included overexpresses VISTA target protein fused to PK alongside VISTA target protein fused to EA. Upon ligand-induced dimerization of VISTA/VISTA , detectable EFC signal is produced. 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, control agonist, detection reagent, and assay plates.