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Neurofilament (NF) subunits NF-H, NF-M and NF-L are hyperphosphorylated and elevated in Alzheimer disease (AD) brain. We investigated the level and phosphorylation states of NF subunits in lumbar cerebrospinal fluid (CSF) from living patients by bienzyme substrate-recycle enzyme-linked immunosorbent assay. We found: (i), that the levels of phosphorylated NF-H/M (pNF-H/M), non-phosphorylated NF-H/M...