Chemokines, or chemotactic cytokines, are a large family of small (6-14 kDa), structurally related proteins that mediate a wide range of biological activities. As a part of normal immune system functions, chemokines are a critical component of basal leukocyte trafficking essential for immune system architecture and development, and immune surveillance. Chemokines also participate in the growth, differentiation, and activation of leukocytes as well as stimulate various effector functions of these cells, such as integrin activation, chemotaxis, superoxide radical production and granule enzyme release. Four classes of chemokines...