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signal molecule |
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signal molecule [sig′nəl] Etymology: L, signum, mark a hormone, neurotransmitter, or other agent that transfers information from one cell or organ to another. Examples include steroid hormones, insulin, and growth factors. A photon may have a similar effect on a retinal receptor. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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