Natural Killer cells are powerful immune system guardians that act without delay. They circulate in the body, scanning for infected or malignant cells, and eliminate them with precision. NK cells play a vital role in disease control, cancer prevention, and immunotherapy research, making them one of the most promising tools in modern medicine. https://xelleratherapeutics.bcz.com/2025/10/03/natural-killer-cells-the-bodys-first-line-of-immune-defense/