?:definition
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guanosine cyclic 3\',5\'-(hydrogen phosphate); a guanine nucleotide containing one phosphate group which is esterified to the sugar moiety in both the 3\'- and 5\'-positions; it is a cellular regulatory agent and a second messenger; its levels increase in response to a variety of hormones, including acetylcholine, insulin, and oxytocin and it has been found to activate specific protein kinases.
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