Used in research settings to study immune responses, particularly as a model antigen in cancer immunotherapy studies. It is known to bind to MHC class I molecules and is often employed to monitor T-cell activation and cytotoxic T-lymphocyte activity in experimental models. Commonly used in vaccine development and immune monitoring assays due to its well-characterized epitope properties. The TFA salt form enhances solubility and stability for in vitro and in vivo applications.