Used in immunotherapy research and development, particularly in oncology and autoimmune diseases. Targets the OX40 receptor to modulate T-cell activation, enhancing anti-tumor immune responses or suppressing excessive immune activity. Investigated for cancer treatment by promoting immune system attack on tumor cells. Also explored in autoimmune conditions to regulate pathological immune reactions. Serves as a reference in bioassays and antibody development due to its specific binding properties. Supports standardization in therapeutic antibody testing and quality control.