Used in biomedical research as a model polypeptide to study immune responses and antigen presentation. Commonly employed in immunology assays to evaluate T-cell activation and cytokine production. Serves as a tool for investigating mechanisms of autoimmune diseases due to its structural similarity to self-proteins. Also utilized in vaccine development for assessing adjuvant efficacy and immune modulation. Its charged nature makes it useful in studies involving protein-protein interactions and electrostatic binding in cellular systems.