AQP4 and nervous system disorder: Increased levels of NF have been observed, for example, in ALS,22 CIS/MS,4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15 neurological diseases related to aquaporin‐4‐ (AQP4‐Ab‐) and myelin oligodendrocyte glycoprotein antibodies (MOG‐Ab), and other neurological diseases.24