MAPT and neuromyelitis optica: CSF: cerebrospinal fluid; WBC: white blood cell; RBC: red blood cell; VDRL: venereal disease research laboratory; NMO: neuromyelitis optica; MOG: myelin oligodendrocyte glycoprotein; OCBs: oligoclonal bands; t-tau: total tau; RT-QuIC: real-time quaking-induced conversion; NMDA: N-methyl-D-aspartate; N/A: not available