ALDH1A2 and myeloid sarcoma: Interestingly, we detected Raldh2 expression in OPCs and microglia/macrophages within normal-appearing white matter (NAWM) of MS patients, in contrast to its expression pattern in the mouse CNS, where Raldh2 is mostly absent in non-lesioned tissues except in the meninges (Morrison et al., 2020).