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Allergic reactions may generally be divided into two components; the early phase reaction, and the late phase reaction. Typically, the infiltrating cells observed in allergic reactions contain a high proportion of lymphocytes, and especially, of eosinophils. Basophils are a type of white blood cell. They produce histamine and serotonin that induce inflammation and heparin that prevents blood clotting, although there are less than that found in mast cell granules. Lymphocytes are white cells that are crucial to our immune systems. There are three main types known as T cells, B cells, and natural killer cells. Neutrophils are phagocytes, capable of ingesting microorganisms or particles. Heparin is a naturally occurring anticoagulant produced by basophils and mast cells. In therapeutic doses, it acts as an anticoagulant, preventing the formation of clots and extension of existing clots within the blood.