NK2 is a type of natural killer cell, which is a crucial component of the immune system. These cells play a vital role in the body's defense against infections and tumors by identifying and destroying harmful cells. They are part of the innate immune response, meaning they act quickly and do not require prior exposure to a pathogen. NK2 cells are characterized by their ability to produce specific cytokines, which are signaling molecules that help regulate immune responses. This production enhances the activity of other immune cells, contributing to a more effective defense against diseases. Understanding NK2 cells can lead to advancements in immunotherapy and treatments for various conditions.