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guanosine (gwah´no-sēn)   a nucleoside, guanine riboside, one of the major constituents of RNA.
 

cyclic guanosine monophosphate  a cyclic nucleotide, guanosine 3′,5′-cyclic monophosphate, an intracellular “second messenger” similar in action to cyclic adenosine monophosphate; the two cyclic nucleotides activate different protein kinases and usually produce opposite effects on cell function. Abbreviated 3′,5′-GMP, cGMP, and cyclic GMP.

guanosine monophosphate(GMP)    a nucleotide important in metabolism and RNA synthesis.

guanosine triphosphate(GTP)    a nucleotide required for RNA synthesis and involved in energy metabolism.





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