Rare populations of premyelinating oligodendroglia (preOL) marked by strong BCAS1 were also detected in this subclustered analysis (Fig. 4c-d, Additional file 9: Fig. S3e), a population recently described in the gray matter of normal adult cortex and in multiple sclerosis lesions [61] which tends to cluster more closely with OPCs than with mature myelinating oligodendrocytes (Ramos et al., in revisions). The gene discussed is BCAS1; the disease is multiple sclerosis.