The CD27:CD70[Biotinylated] Inhibitor Screening Assay Kit is designed for screening and profiling inhibitors of CD27:CD70 signaling. This kit comes in a convenient 96- well format, with biotin-labeled CD70, purified CD27, streptavidin-labeled HRP, and assay buffer for 100 binding reactions. The key to this kit is the high sensitivity of detection of biotin-labeled CD70 by streptavidin-HRP. Only a few simple steps on a microtiter plate are required for the assay. First, CD27 is coated on a 96-well plate. Next, CD70 is incubated with CD27 on the plate. Finally, the plate is treated with streptavidin-HRP followed by addition of an HRP substrate to produce chemiluminescence, which can be measured using a chemiluminescence reader.