Cells in this unique mTEC cluster also expressed brain-specific genes included in the yellow module, such as GABRA5, MAP2, NEFL, NEFM, SOX15, TF. Their ectopic expression was also confirmed immunohistochemically in MG-thymoma tissue sections (Fig. 3e, Supplementary Fig. 9c, d). Here, SOX15 is linked to thymoma.