How our immune system teaches our cells to “behave”

The T cell university

At a very early stage of a T-cell-to-be, an immature immune cell will enter the thymus and receive a variety of important information, which allows it to develop and mature in this organ. At some point during this process, our T-cell-to-be is required to pass an “exam” composed of two simple but crucial questions. The first question is, “Are you a functional T cell?” If the answer is yes, this developing T cell-to-be must answer a second question: “Are you going to kill enemies or friends?”