Used in biomedical research to detect and quantify cathepsin enzyme levels in biological samples such as serum, plasma, and tissue extracts. Widely applied in studies related to inflammation, cancer progression, autoimmune diseases, and bone metabolism due to the role of cathepsins in protein degradation and cellular remodeling. Enables researchers to assess enzyme activity and expression changes under disease conditions or after therapeutic interventions. Commonly used in preclinical studies and drug development to evaluate targets and biomarkers.