In the acute schizophrenia group, SOD activity of IgGs also did not differ in individuals with leading positive and negative symptoms (15.41 (6.90; 17.72) and 18.49 (8.48; 32.27) μM diformazan/min/IgG mg, respectively; p = 0.401; Figure 5B). Here, SOD1 is linked to schizophrenia.