RBFOX3 and myeloid sarcoma: Quantification of western blots for AIS proteins normalized to NeuN shows no statistical differences between MS patients and controls (Fig. 7Bb), although the high variability of Ctip2 levels in the MS punches suggests variable sampling of deep cortical layers (e.g. unseen cortical folds near sulci causing inclusion of Ctip2-negative superficial cortical layers).