OLIG2 and myeloid sarcoma: Moreover, previous reports have shown that Olig2 participates in not only the OL development stages but also in myelin repair in MS models (Sun et al., 2013; Tan et al., 2014; Tomas-Roig et al., 2016), although the exact role of Olig2 in CNS demyelinating models remains controversial according to recent evidences (Buffo et al., 2005; Hu et al., 2012).