Used in research and development of therapies targeting B-cell related immune disorders. Plays a role in studying autoimmune diseases such as systemic lupus erythematosus (SLE) and rheumatoid arthritis by modulating immune responses. Employed as a soluble receptor to neutralize BAFF and APRIL, two key cytokines involved in B-cell activation and survival. Supports drug discovery efforts by serving as a tool to evaluate the efficacy of anti-BAFF/APRIL treatments. Also used in protein-protein interaction studies and immunoassays due to its high binding affinity and stability.