Used in research and development for autoimmune diseases, particularly in studies involving regulatory T cells (Tregs). It modulates CD4 receptor signaling in a unique way, promoting selective activation of Tregs without stimulating effector T cells. This property makes it a candidate for treating conditions like rheumatoid arthritis and systemic lupus erythematosus, where immune system regulation is critical. It has been investigated in clinical trials to evaluate its safety and immunomodulatory effects in humans.

Also serves as a reference standard in immunoassays and bioassays involving CD4-targeting therapeutics, including use as a positive control in techniques such as ELISA, flow cytometry, and immunohistochemistry. It aids in quality control, specificity testing of new antibodies, and methods for detecting or isolating CD4+ T cells from other cell populations.