FFAR2 and myeloid sarcoma: We further analyzed the scRNA-seq data of CSF cells in other studies and found that the MO and NEU cells (S100A8+ and S100A9+) in the CSF of HIV and MS patients expressed low levels of THBS1+IL1B+ MO and FFAR2+TNFAIP6+ NEU-related feature genes (Supplementary Figures S9, S10).