1. 
   Second messenger
   A second messenger is an intracellular metabolite or ion increasing or decreasing as a response to the stimulation of receptors by agonists, considered as the 'first messenger'. This generic term usually does not prejudge the rank order of intracellular biochemical events.
   Found op http://www.chem.qmul.ac.uk/iupac/medchem/ix.html
   
   
2. 
   second messenger
   In many hormone-sensitive systems the systemic hormone does not enter the target cell but binds to a receptor and indirectly affects the production of another molecule within the cell; this diffuses intracellularly to the target enzymes or intracellular receptor to produce the response. This intrace...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   second messenger
   <molecular biology> In many hormone sensitive systems the systemic hormone does not enter the target cell but binds to a receptor and indirectly affects the production of another molecule within the cell, this diffuses intracellularly to the target enzymes or intracellular receptor to produce ...
   Found op http://www.mondofacto.com/facts/dictionary?second+messenger
   
   
4. 
   second messenger
   Type: Term Definitions: 1. an intermediary molecule that is generated as a consequence of hormone-receptor interaction, see adenosine 3′,5′-cyclic monophosphate, guanosine 3′,5′-cyclic monophosphate, calcium, inositide.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=54529
   
   
5. 
   second messenger
   A molecule or ion whose concentration within a target cell is increased by the action of a regulatory compound (e.g., a hormone or neurotransmitter) and which stimulates the metabolism of that target cell in a way that mediates the intracellular effects of that regulatory compound.
   Found op http://www.mhhe.com/biosci/abio/glossary.mhtml
   
   
6. 
   second messenger
   A molecule or ion whose concentration within a target cell is increased by the action of a regulatory compound (e.g., a hormone or neurotransmitter) and which stimulates the metabolism of that target cell in a way that mediates the intracellular effects of that regulatory compound.
   Found op http://www.mhhe.com/biosci/abio/glossary.mhtml
   
   

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