NCAM2 and myeloid sarcoma: The MFI for the expression of negative control and NCAM2 from SK-N-SH cell-line (the quantitative analysis for Fig. 2A and B) is shown in Supplementary Fig. 6A, while the MFI for antibodies from control and MS patients’ CSF (the quantitative analysis for Fig. 2C and D) binding to SK-N-SH cell-line is shown in Supplementary Fig. 6B.