A type of white blood cell that helps the immune system fight infections and diseases, including cancer. They are part of the immune system and develop from stem cells in the bone marrow.

Why this matters

T cells play a major role in immunity, making them importsnt for vaccines, autoimmune diseases, and cancer treatments. There are different types of T cells, like killer T cells (attack infected cells) and helper T cells (boost immune response).

LINK: https://my.clevelandclinic.org/health/body/24630-t-cells