Administration of AP1903 affects iC9-T cells in CSF. Detection of iC9-T cells in CSF and PB by flow cytometry before and after administration of AP1903 (Pt. 6). Nine days before CID treatment in CSF (A) and in PB (B), and 14 days after treatment in CSF (C) and in PB (D). The percentage of CD3⁺CD19⁺ T cells and CD3⁺CD19⁻ T cells was calculated under the gate of CD3⁺ T cells.