ID2 and glioblastoma: Likewise, the preferential expression of ETS2 in tumour-associated microglia/macrophages, in a glioblastoma tumour context, as compared to ID2 being expressed in myeloid and neoplastic cells, was also observed in two other RNA-sequencing datasets consisting of 3589 single cells originating from four adult GB tumours, and 7930 single cells originating from 28 adult and paediatric GB tumours [12, 23].