Diffuse cytoplasmic staining of Nogo-A was observed in OLCs in all samples (Fig. 5, Supplementary Figs. 6 and 8 and Supplementary Table 3); positive staining of Nogo-A was also observed in astrocytic component of RGNT, white matter oligodendrocytes, parts of neurons and the background myelin sheaths.47,48 Tumour cells showed negative staining for ENPP6 and MBP in all samples analysed (Supplementary Fig. 9). This evidence concerns the gene RTN4 and neoplasm.