الوقت المتطلب للقراءة 5 دقيقة How CAR T-Cell Therapy Works Immune Receptors and Foreign Antigens The immune system recognizes foreign substances in the body by finding proteins called antigens on the surface of those cells. Immune cells known as T-cells have their own special proteins called receptors that bind to foreign antigens and help stimulate other parts of the immune system to destroy the foreign material. The relationship between antigens and immune receptors is like a lock and key. Just as a lock can only be opened with the correct key, each foreign antigen has a unique immune receptor that can bind to it. Cancer cells also have antigens, but if your immune cells do not have the correct receptors, they will not be able to bind to the antigens and help destroy the cancer cells.