IL2, or Interleukin-2, is a type of cytokine, which is a protein that plays a crucial role in the immune system. It is primarily produced by T cells, a type of white blood cell, and is essential for the growth, proliferation, and differentiation of T cells and B cells. IL2 helps regulate the immune response, promoting the activation and expansion of immune cells that fight infections and diseases. In medical research, IL2 is studied for its potential in cancer therapy and autoimmune diseases. It can enhance the body’s immune response against tumors, making it a candidate for treatments in conditions like melanoma and renal cell carcinoma. Additionally, IL2 is being explored for its role in gene therapy and immunotherapy approaches.