What specific type of immune cells are mentioned as being relevant to the research?

Natural killer (NK) cells are a crucial component of the innate immune system, playing a significant role in the body's defense against tumors and virally infected cells. They are characterized by their ability to recognize stressed cells in the absence of antibodies and major histocompatibility complex (MHC), allowing them to respond quickly to a wide variety of pathological challenges.

Research has highlighted the importance of NK cells in various immunological responses and therapies. These cells not only induce apoptosis in infected or malignant cells but also produce cytokines that further influence the immune response. This capability makes them a focal point in studies related to cancer immunotherapy, viral infections, and autoimmunity.

In the context of the question, the relevance of NK cells in research underlines their function in modulating immune responses and their potential therapeutic applications. This makes them a particularly interesting area of study within the field of kinesiology, as understanding immune function can inform approaches to physical training, recovery, and overall health management.