Fig. (1) (A) Global arginine bioavailability ratio (GABR) in plasma of patients with early stage Alzheimer’s Disease (AD) and their respective controls (Mean ± SEM; n=46; ***P<0.001). (B) Nitric oxide levels measured as nitrate plus nitrite (NOx) in plasma of patients with early stage Alzheimer’s disease (AD) and their respective controls. Results are expressed in µmol/L (Mean ± SEM; n=46; **P<0.01). (C) Analysis using Area Under the Curve (AUC) from Receiver Operator Characteristic (ROC) curve showing differentiation between AD patients and healthy controls based on Global Arginine Bioavailability Ratio (GABR) levels (AUC=0.877)