Human MCP-4 (CCL13)—also known as CK-beta 10, NCC-1, and small-inducible cytokine A13 (SCYA13)—is an 11 kDa chemotactic factor that attracts monocytes, lymphocytes, basophils, and eosinophils. MCP-4 binds to CCR2B and CCR3 and plays a major role in the recruitment of leukocytes in allergic and non-allergic inflammation. It is involved in rheumatoid arthritis and chronic obstructive pulmonary disease. The Human MCP-4 Kit provides assay-specific components for the quantitative determination of endogenous MCP-4 in human urine, serum, plasma, and cell culture supernatants.