PHA is widely used in biomedical research due to its ability to stimulate T-cell proliferation. It is commonly employed in lymphocyte activation studies to assess immune cell function and responsiveness. In clinical diagnostics, PHA serves as a mitogen in tests like the lymphocyte transformation assay to evaluate immune system competence. Additionally, it is utilized in cell culture experiments to study cell division and growth mechanisms. PHA also finds applications in agglutination assays for blood typing and immunological studies. Its role in inducing cell signaling pathways makes it a valuable tool in understanding immune responses and cellular communication.