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Interleukin 8 (IL-8 )(CXCL8) is secreted primarily by macrophages and monocytes. It is one of the key mediators for inflammatory responses. IL-8 is a strong chemotractant for neutrophils and monoccytes, and promotes activation of these target cells by binding to two cell surface receptors CXCR1 and CXCR2. It is also a strong angiogenic agent, and is considered to play a role in the pathogenesis of bronchiolitis.