Natural Killer (NK) cells are critical to the body’s innate immunity, serving as fast responders to infection and cancer. Using specialized receptors, they recognize abnormal cells and destroy them. Their ability to act without prior sensitization makes them unique. NK cells are central to emerging immunotherapies, offering new hope in treating cancer and viral diseases. https://xelleratherapeutics.bcz.com/2025/10/03/natural-killer-cells-the-bodys-first-line-of-immune-defense/