In a subgroup of BPD FPC samples, in which two peaks of olig2(+) populations could be clearly measured (9 control, 9 BPD), significant decreases were also found in the densities of both olig2strong(+) (−28%, P = 0.034) and olig2weak(+) nuclei (−53%, P = 0.008) (Figure 2), suggesting that oligodendroglial reductions in the BPD FPC may stem from decreased levels of OPCs (olig2strong(+)) and OLs (olig2weak(+)), as was observed in the FPC from subjects with MDD [16]. Here, OLIG2 is linked to major depressive disorder.