Tag-lite is a non-radioactive,cell-based, no-wash alternative to the traditional radioisotope assays to study GPCR-ligand interaction. Learn more. Tag-lite Assays and Reagents A comprehensive portfolio of a wide selection of ligand binding solutions for over 43 GPCRs. Tag-lite services From compound characterization to small- and large-scale reagent preparation and full assay development. Tag-lite Tool box A selection of plasmids and fluorescent substrates for developing your own assays.