NEFH and amyotrophic lateral sclerosis: Plasma Nf‐H Abs were elevated in ALS patients in both ABC (p = 0.0023) and PGB (p = 0.01) compared to HC and had higher expression levels in ALS‐F compared to HC in both ABC (p < 0.0001) and PGB (p < 0.05) (Fig. 2E and F).