Used in biomedical research to quantify levels of the FAS/CD95 protein in cell lysates, serum, or plasma. Enables researchers to study apoptosis pathways, particularly in immune regulation and cancer development. Commonly applied in studies involving autoimmune diseases, neurodegenerative disorders, and drug-induced cytotoxicity. Supports high-throughput screening of therapeutic agents that modulate cell death mechanisms. Provides a reliable, sensitive method for detecting soluble FAS antigen, aiding in the understanding of disease progression and treatment response.