Used in immunological research to quantify fractalkine (CX3CL1) levels in biological samples such as serum, plasma, and cell culture supernatants. Helps in studying inflammatory processes, immune cell migration, and neuroinflammation. Commonly applied in research on autoimmune diseases, cardiovascular conditions, and neurological disorders like Alzheimer's and multiple sclerosis. Enables researchers to assess the role of fractalkine in disease progression and response to treatment.