Figure 7a shows the Ng levels of control versus AD CSF samples, as determined by the C‐terminal Ng sandwich ELISA (NG36/NG2) [p = .04 (unpaired t‐test with Welsh's correction), N, number of individuals: control = 9 and AD = 11; median control = 137, median AD = 179; control standard deviation (SD) = 65.3, AD SD = 31.1]. The gene discussed is NRGN; the disease is Alzheimer disease.