CSF Ng concentration showed a weak negative correlation with CSF Aβ42 in ADD (rhos = −0.15, p = 0.004) while a stronger positive correlation with CSF Aβ42 was found in ALS (rhos = 0.48, p < 0.0001) (Fig. 3a, b). This evidence concerns the gene NRGN and amyotrophic lateral sclerosis.