Used in biochemical assays to detect and quantify cathepsin G activity, an enzyme involved in inflammatory processes and immune responses. The substrate is cleaved specifically by cathepsin G, producing a measurable signal, often colorimetric or fluorescent, allowing researchers to study enzyme kinetics, screen inhibitors, and investigate the role of cathepsin G in diseases like emphysema, arthritis, and certain cancers. Commonly applied in drug development and diagnostic research targeting protease activity.