Macrophage Inflammatory Proteins (MIP) belong to the family of chemotacticcytokines known as chemokines. In humans, there are two major forms, MIP-1α and MIP-1β, renamed CCL3 and CCL4 respectively, since 2000.[3] However, other names are sometimes encountered in older literature, such as LD78α, AT 464.1 and GOS19-1 for human CCL3 and AT 744, Act-2, LAG-1, HC21 and G-26 for human CCL4.[4] Other macrophage inflammatory proteins include MIP-2, MIP-3 and MIP-5.