KeyTec® TR-FRET PD1/PD-L1 Binding Assay Kit is designed for the quantitative measurement of the interaction between human PD1 and PD-L1 proteins. This kit provides a Tag1-PD-L1 protein, a Tag2-PD1 protein, an anti-tag1 antibody labeled with KeyTec® TR-FRET Solar Eu*1 (mAb anti-Tag1 - Solar Eu) ,an anti-tag2 antibody labeled with KeyTec® TR-FRET LA*2 (mAb anti-Tag2 - LA) and other detection reagents. These components enable the high-throughput screening of small molecule inhibitors, peptides, or antibody blockers.