GPR17 and myeloid sarcoma: Interestingly, recent data coming from single-nucleus RNA sequencing of post-mortem white matter samples from human brain of MS patients and unaffected controls indicated that GPR17 expression is restricted to specific oligodendroglial subclusters, namely OPCs and committed oligodendrocyte precursors, although these results are not sufficient to compare the receptor levels in MS lesions and in the NAWM with healthy tissues [18].