Human Interleukin-2 (IL-2) is a key cytokine in the immune system that plays a central role in regulating the growth, activation, and differentiation of T lymphocytes. It is primarily produced by activated CD4+ T cells and is essential for maintaining immune responses.

IL-2 is critical for immune system balance, as it promotes the proliferation of effector T cells while also supporting the development of regulatory T cells, which help control immune reactions and prevent autoimmunity.

In biomedical research, Human IL-2 is widely studied for its applications in immunotherapy, cancer treatment, and autoimmune disease regulation. It is also used in laboratory studies to understand T-cell signaling pathways and immune system modulation.

Due to its importance in immune activation and regulation, IL-2 remains a major focus in both clinical and experimental immunology research.