First, we filtered the datasets using a common filtering criterion to remove clusters of terminally differentiated oligodendrocytes (MBP and PLP1) (Valério‐Gomes et al, 2018), astrocytes (ETNPPL) (Zhang et al, 2016c), neurons (RBFOX3) (Herculano‐Houzel & Lent, 2005), and immune cells (AIF1, CD14, CX3CR1, PTPRC), which were distinct from tumor cell clusters. Here, MBP is linked to neoplasm.