Interferon protein. Computer molecular graphic of interferon alpha 2B, a protein released by the immune system in response to a viral infection. Like all proteins, it is comprised of amino acids. Interferon alpha is produced by all white blood cells (leukocytes) when stimulated by the presence of a virus. It acts as a cytokine, affecting the cells around it. It inhibits the production of the virus within infected cells and enhances the response of other leukocytes.
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