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Definition of Signal transduction

Signal transduction: A basic process in molecular cell biology involving the conversion of a signal from outside the cell to a functional change within the cell.

A signal (such as a hormone or neurotransmitter) interacts with a receptor on the cell surface; this interaction causes a change in a second messenger (such calcium); and, eventually, a change is triggered in the cell's function (for example, the cell divides).

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=11936
Last Editorial Review: 6/14/2012

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