In contrast, neither the number of NG2-positive OPCs (paraffin section, Fig. 1b, e, h; frozen section, Supplementary Fig. 1c, f) nor the number of OLIG2-positive oligodendroglial cells (paraffin section, Fig. 1j, k) per area unit was affected in schizophrenia patients. Here, OLIG2 is linked to schizophrenia.