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cytokine

/ˈsaɪtəʊˌkaɪn/
noun
1.
any of various proteins, secreted by cells, that carry signals to neighbouring cells. Cytokines include interferon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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cytokine in Medicine

cytokine cy·to·kine (sī'tə-kīn')
n.
Any of several nonantibody proteins, such as lymphokines, that are released by a cell population on contact with a specific antigen and act as intercellular mediators, as in the generation of an immune response.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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cytokine in Science
cytokine
  (sī'tə-kīn')   
Any of several regulatory proteins, such as the interleukins and lymphokines, that are released by cells of the immune system and act as intercellular mediators in the generation of an immune response. Also called chemokine.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for cytokine

any of a group of small, short-lived proteins that are released by one cell to regulate the function of another cell, thereby serving as intercellular chemical messengers. Cytokines effect changes in cellular behaviour that are important in a number of physiological processes, including reproduction, growth and development, and injury repair. However, they are probably best known for the roles they play in the immune system's defense against disease-causing organisms

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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