Lymphokines are a subset of cytokines that are produced by a type of immune cell known as a lymphocyte. They are typically produced by T cells to direct the immune system response by signaling between its cells. Lymphokines have many roles, including the attraction of other immune cells, like macrophages and other lymphocytes, to an infected site and their subsequent activation prepare them to attack the invaders. Cirulating lymphocytes can detect a very small concentration of lymphokine and then move up the concentration gradient towards where the immune response is required.
