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An LC–MS/MS method was developed and validated to quantify endogenous cyclic guanosine 3′,5′-monophosphate (cGMP) in human plasma. The LC–MS/MS and competitive enzyme immunoassay (EIA) assays were compared. cGMP concentrations of 20 human plasma samples were measured by both methods. For the MS-based assay, plasma samples were subjected to a simple protein precipitation procedure by acetonitrile prior...
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