The CD38 Inhibitor Screening Assay Kit (Hydrolase Activity) is designed to measure the glycohydrolase activity of CD38 for screening and profiling applications. The CD38 assay kit comes in a convenient 96-well format, with purified recombinant CD38 enzyme, its substrate N6-etheno-NAD (ε-NAD), and CD38 assay buffer for 100 enzyme reactions. In addition, the kit includes the CD38 inhibitor apigenin for use as a control inhibitor.