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IntroductionSchizophrenia (SCH) and bipolar disorder (BD) are severe mental disorders which lead to psychotic, affective and cognitive symptoms and often cause a progressive functional deterioration of the individual. The current diagnosis of SCH and BD essentially depends on clinical observation that often leads to misdiagnosis and the introduction of non-specific treatments. Therefore, an early detection and intervention are determinant for a better prognosis. Improving outcomes of a First Episode of Psychosis (FEP) depends mainly on the identification of reliable and discriminatory biomarkers between both disorders.ObjectivesGiven that oxidative stress has been tightly involved in multiple metal disorders, the major goal of this work was to characterize oxidative alterations in order to identify potential biomarkers which allow the differential diagnosis in an early stage.MethodsThe study was carried out on …