The PARP2 Colorimetric Activity Assay Kit is designed to measure PARP2_x000D_activity for screening and profiling applications. PARP2 is known to catalyze the NAD-dependent_x000D_addition of poly(ADP-ribose) to histones. The key to the PARP2 Colorimetric Activity_x000D_Assay is the biotinylated substrate. With this kit, only three simple steps are required for PARP2_x000D_reactions. First, histone proteins are coated on a 96-well plate. Next, the PARP2 biotinylated_x000D_substrate is incubated with an assay buffer that contains the PARP2 enzyme. Finally, the plate_x000D_is treated with streptavidin-HRP followed by addition of the colorimetric HRP substrate to_x000D_produce color that can then be measured using a UV/Vis spectrophotometer microplate reader.