Conversely, a higher expression of IFN-γ was observed in the HC group after incubation with HERV-K env 109–126 (ALS vs. HCs, mean ± SD = 0.277 ± 0.196 vs. 1.26 ± 0.365; p = 0.0023) (Figure 3c). Here, IFNG is linked to amyotrophic lateral sclerosis.