Natural Killer cells are specialized white blood cells that provide frontline defense against infections and tumors. Unlike other immune cells, NK cells do not require prior exposure to threats. They act immediately, releasing proteins that destroy harmful cells. Their importance in immunology and cancer therapies highlights their power in safeguarding health and driving innovation. https://xelleratherapeutics.bcz.com/2025/10/03/natural-killer-cells-the-bodys-first-line-of-immune-defense/