OLIG2 and fetal growth restriction: However, the abundance of Olig2 expression (volume of nuclear staining), a transcriptional factor directly linked to the myelination process in oligodendrocytes [50], was decreased in the CA1 of IUGR versus sham female mice (MW U (4.0) p = 0.045, n = 7/group) with a similar trend in CA3 (MW U (5.0) p = 0.068, Fig. 4c1).