Definition:

Cytokines

              Lymphokines = made by lymphocytes

              Monokines = made by monocytes

              Chemokines = with chemotactic activities; attract leukocytes to infection sites

              Interkeukins = made by one leukocyte and acting on other leukocytes

Cytokine actions

              Autocrine = act on cells that secrete them

              Paracrine = act on nearby cells

              Endocrine = act on distant cells