In nonspecific immunologic reactions, such as inflammation, and in specific immune responses to discrete foreign antigens, white blood cells release a variety of signaling proteins called cytokines. These proteins make other immune cells proliferate, differentiate, or become better cell killers. Which of the following are not examples of cytokines?

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The cytokines include the interleukins, interferons, tumor necrosis factor, erythropoietin, and other molecules. These proteins attract white cells to foreign antigens, make macrophages and lymphocytes more immunologically active, increase the lethality of natural killer cells, raise body temperature, and have other immunological effects. Corticosteroids are agents produced by the adrenal cortex (or given therapeutically) that have a variety of functions. Immunologically, they dampen many immune responses. Antihistamines are chemicals that block histamine, a chemical released by eosinophils and mast cells that has many immunologically active functions.

In Nonspecific Immunologic Reactions, Such as Inflammation, and in Specific