Used for quantitative detection of E2 ubiquitin-conjugating enzyme activity in human biological samples such as cell lysates, serum, or plasma. This ELISA kit enables researchers to measure changes in E2/UBCE activity associated with ubiquitin-mediated protein degradation pathways. It is commonly applied in studies related to cellular regulation, cancer, neurodegenerative diseases, and autoimmune disorders where ubiquitination plays a critical role. The assay supports high-throughput screening and evaluation of enzyme inhibitors or activators in drug development and molecular biology research.