Used in clinical research and therapeutic development for immune-mediated diseases. Targets interleukin-15 (IL-15) to modulate T-cell and natural killer (NK) cell activity. Investigated for treating autoimmune conditions such as rheumatoid arthritis, inflammatory bowel disease, and celiac disease. Also explored in transplant medicine to reduce graft-versus-host disease and organ rejection by suppressing T-cell activation. Serves as a reference standard in bioassays and antibody development programs.