Used to measure JNK (c-Jun N-terminal kinase) activity in human cell or tissue samples. This kit is widely applied in research settings to study cellular stress responses, inflammation, apoptosis, and signaling pathways involved in diseases such as cancer, neurodegenerative disorders, and autoimmune conditions. It enables researchers to evaluate the effects of drugs, inhibitors, or genetic modifications on JNK signaling, supporting drug development and mechanistic studies in molecular and cell biology.