Used for measuring ubiquitin-proteasome system (UPS) activity in human biological samples such as cell lysates, tissue extracts, and body fluids. This ELISA kit enables researchers to quantify specific UPS components or their activity levels, which is critical in studying protein degradation pathways. It is widely applied in research on neurodegenerative diseases (like Alzheimer's and Parkinson's), cancer, autoimmune disorders, and other conditions where abnormal protein accumulation or turnover is involved. The assay supports drug development and evaluation of therapeutic agents targeting proteasome function. Its high sensitivity and specificity make it suitable for both clinical research and basic science investigations into cellular protein homeostasis.