GFAP and neuromyelitis optica: Concentrations of HS and HA in plasma and CSF were elevated in the autoimmune encephalitis group compared with those in the control group (serum HS: NMO p<0.001, MS p=0.022, GFAP p<0.001, respectively, Figure 1A; CSF HS: NMO p<0.001, MS p<0.001, GFAP p< 0.001, respectively, Figure 1B.