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Figure 3 Cyclic guanosine monophosphate (cGMP) levels in platelets and platelets plus neutrophils obtained from healthy volunteers and patients during acute coronary syndromes. Determination of cGMP levels were performed in platelets alone (PLT) or coincubated with neutrophils (PMN). Platelets and neutrophils were obtained from peripheral blood of healthy volunteers (control) and patients during unstable angina (UA) and during acute myocardial infaction (AMI). Results are represented as mean ± SEM. *p < 0.05 with respect to the corresponding platelets alone.